<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:b8a99e8b-f402-4690-bdc1-450a0ad7afd8,g:61d9e363-afea-4a99-af4c-319810c07c9e-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.fleetcor.com/role/UnauditedStatementofStockholdersEquity" xlink:type="simple" xlink:href="flt-20220930.xsd#UnauditedStatementofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/UnauditedStatementofStockholdersEquity" xlink:type="extended" id="i132b3165ab0e4367b8c92a1dfcd56d43_UnauditedStatementofStockholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_2255e854-9b09-40df-9d8f-296580d09e90" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2255e854-9b09-40df-9d8f-296580d09e90" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b173709e-918a-4227-b0c4-431439655758" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:to="loc_us-gaap_StockholdersEquity_b173709e-918a-4227-b0c4-431439655758" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_5b0d5a1d-3f10-4ceb-8e2b-f29ac36fde68" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:to="loc_us-gaap_NetIncomeLoss_5b0d5a1d-3f10-4ceb-8e2b-f29ac36fde68" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_68d38692-879d-4e83-bd1a-cf235af60c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_68d38692-879d-4e83-bd1a-cf235af60c9e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_ef30c219-4843-435e-9a0b-9527ab0c3451" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_ef30c219-4843-435e-9a0b-9527ab0c3451" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_337f1171-41fc-4aa0-8c1f-601e39f5b1dd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_337f1171-41fc-4aa0-8c1f-601e39f5b1dd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_7c12ad58-8f7b-4c91-8dd1-c6b75834ef66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8faf896e-b4c3-42b0-bcbe-8684b50d4b1c" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_7c12ad58-8f7b-4c91-8dd1-c6b75834ef66" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_9f05b566-595c-4c19-8b27-2686e910dd41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_c6ce503c-ddfc-42e7-9eea-6f48999273cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2255e854-9b09-40df-9d8f-296580d09e90" xlink:to="loc_us-gaap_StatementTable_c6ce503c-ddfc-42e7-9eea-6f48999273cf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_620fd578-504f-4a7f-bf25-fd72dbf9a7e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_c6ce503c-ddfc-42e7-9eea-6f48999273cf" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_620fd578-504f-4a7f-bf25-fd72dbf9a7e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_620fd578-504f-4a7f-bf25-fd72dbf9a7e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_620fd578-504f-4a7f-bf25-fd72dbf9a7e7" xlink:to="loc_us-gaap_EquityComponentDomain_620fd578-504f-4a7f-bf25-fd72dbf9a7e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5811d25b-931b-4ddd-b4ab-e61fa94fc761" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_620fd578-504f-4a7f-bf25-fd72dbf9a7e7" xlink:to="loc_us-gaap_EquityComponentDomain_5811d25b-931b-4ddd-b4ab-e61fa94fc761" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_8f96f37a-7606-4dc8-b8fb-dce2f46fd1f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5811d25b-931b-4ddd-b4ab-e61fa94fc761" xlink:to="loc_us-gaap_CommonStockMember_8f96f37a-7606-4dc8-b8fb-dce2f46fd1f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_66562230-cf67-4ff8-bbb6-441f711211d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5811d25b-931b-4ddd-b4ab-e61fa94fc761" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_66562230-cf67-4ff8-bbb6-441f711211d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_9038a74b-7900-49d8-b2d3-a42bee9fcb85" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5811d25b-931b-4ddd-b4ab-e61fa94fc761" xlink:to="loc_us-gaap_RetainedEarningsMember_9038a74b-7900-49d8-b2d3-a42bee9fcb85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_86cc7e75-2e35-4a9e-9258-f34e980fc426" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5811d25b-931b-4ddd-b4ab-e61fa94fc761" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_86cc7e75-2e35-4a9e-9258-f34e980fc426" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_bb41c617-0309-4694-a256-d0a5d5251ad4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5811d25b-931b-4ddd-b4ab-e61fa94fc761" xlink:to="loc_us-gaap_TreasuryStockCommonMember_bb41c617-0309-4694-a256-d0a5d5251ad4" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesForeignCurrencyTranslationDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#SummaryofSignificantAccountingPoliciesForeignCurrencyTranslationDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesForeignCurrencyTranslationDetails" xlink:type="extended" id="i237662d52f3e4f24bf89e3a313e31336_SummaryofSignificantAccountingPoliciesForeignCurrencyTranslationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_c1682299-62fc-4ac2-90b5-48eef5a05575" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_01b71ea7-e1f9-46ef-a9b9-9f4a1df13233" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_c1682299-62fc-4ac2-90b5-48eef5a05575" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_01b71ea7-e1f9-46ef-a9b9-9f4a1df13233" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_604179d5-4a34-41c9-b3ec-d81eefeeea7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_c1682299-62fc-4ac2-90b5-48eef5a05575" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_604179d5-4a34-41c9-b3ec-d81eefeeea7a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_4a74b451-95c5-4900-a0b9-3f86b3acc57c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_604179d5-4a34-41c9-b3ec-d81eefeeea7a" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_4a74b451-95c5-4900-a0b9-3f86b3acc57c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_4a74b451-95c5-4900-a0b9-3f86b3acc57c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_4a74b451-95c5-4900-a0b9-3f86b3acc57c" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_4a74b451-95c5-4900-a0b9-3f86b3acc57c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_7353c06b-d699-4785-8f27-43fdde4b7266" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_4a74b451-95c5-4900-a0b9-3f86b3acc57c" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_7353c06b-d699-4785-8f27-43fdde4b7266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_IntraentityTransactionsMember_c24551a6-27ab-41ab-b0cc-007c75b59456" xlink:href="flt-20220930.xsd#flt_IntraentityTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_7353c06b-d699-4785-8f27-43fdde4b7266" xlink:to="loc_flt_IntraentityTransactionsMember_c24551a6-27ab-41ab-b0cc-007c75b59456" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" id="i171a35020c924153bf67be8e7f339ad2_SummaryofSignificantAccountingPoliciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_8824dfc2-8835-4d52-849b-20f2272ad3f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_Cash_8824dfc2-8835-4d52-849b-20f2272ad3f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_39d04775-a801-40fc-ba4a-31606f4c170d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_39d04775-a801-40fc-ba4a-31606f4c170d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_d7b1626d-d4ac-4fe9-9aea-6840d4c8f92c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_ContractWithCustomerLiability_d7b1626d-d4ac-4fe9-9aea-6840d4c8f92c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_83b91a45-a12d-41c1-9bf7-35a387d81601" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_83b91a45-a12d-41c1-9bf7-35a387d81601" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2fcee442-cb87-4628-a9dc-3859bc72ce06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2fcee442-cb87-4628-a9dc-3859bc72ce06" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_d578d53d-d0f9-48b6-a6e1-e87d99022200" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_d578d53d-d0f9-48b6-a6e1-e87d99022200" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_a8b9f7d6-a539-4e21-b6cd-fd759b7d5e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_a8b9f7d6-a539-4e21-b6cd-fd759b7d5e2d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_ab65f83e-c9a5-4b87-a0a5-7a9e1e27e98c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_ab65f83e-c9a5-4b87-a0a5-7a9e1e27e98c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe430b83-5af5-40ca-b038-568cfbadb859" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe430b83-5af5-40ca-b038-568cfbadb859" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeBasisSpreadOnVariableRate_23cb6213-f46f-4a7b-8864-9150fd3f0450" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeBasisSpreadOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_DerivativeBasisSpreadOnVariableRate_23cb6213-f46f-4a7b-8864-9150fd3f0450" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_09f7a0b8-81c2-428f-926e-01688d022f91_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:to="loc_srt_ProductsAndServicesDomain_09f7a0b8-81c2-428f-926e-01688d022f91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a292224d-611a-462d-a3fe-4d3a73bfe62e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:to="loc_srt_ProductsAndServicesDomain_a292224d-611a-462d-a3fe-4d3a73bfe62e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ContractswithCustomersMember_d77a504d-5e3c-46cb-a75b-02e706649e47" xlink:href="flt-20220930.xsd#flt_ContractswithCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a292224d-611a-462d-a3fe-4d3a73bfe62e" xlink:to="loc_flt_ContractswithCustomersMember_d77a504d-5e3c-46cb-a75b-02e706649e47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_7707c510-0360-42e5-94a7-a6ffe9975d5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_7707c510-0360-42e5-94a7-a6ffe9975d5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_dc6dcbed-6afd-4a8b-9484-57b111e34690" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_dc6dcbed-6afd-4a8b-9484-57b111e34690" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_9e790812-9059-420a-86f5-f8ce05a51dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_dc6dcbed-6afd-4a8b-9484-57b111e34690" xlink:to="loc_us-gaap_SalesRevenueNetMember_9e790812-9059-420a-86f5-f8ce05a51dd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b8863ab6-a712-4873-a64c-e4bb2c9b1871_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b8863ab6-a712-4873-a64c-e4bb2c9b1871_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b201a71d-073a-462a-af2a-2a77df657aaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b201a71d-073a-462a-af2a-2a77df657aaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_8a97f649-2476-4c4e-8bf9-fda02faa5b50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_b201a71d-073a-462a-af2a-2a77df657aaa" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_8a97f649-2476-4c4e-8bf9-fda02faa5b50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_bafad68b-c858-48ce-9b30-3ba41738c187_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:to="loc_srt_RestatementDomain_bafad68b-c858-48ce-9b30-3ba41738c187_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_1e28e725-9775-41a1-913b-437654ff6f6c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:to="loc_srt_RestatementDomain_1e28e725-9775-41a1-913b-437654ff6f6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_53f5c15d-5fff-4205-b116-03382f6f11bd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_1e28e725-9775-41a1-913b-437654ff6f6c" xlink:to="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_53f5c15d-5fff-4205-b116-03382f6f11bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_6ee067fd-04cc-4369-b9bf-9506be57a4ba_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:to="loc_srt_SegmentGeographicalDomain_6ee067fd-04cc-4369-b9bf-9506be57a4ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_6d7709bf-7b65-4cff-9f24-76f1a7ec5149" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:to="loc_srt_SegmentGeographicalDomain_6d7709bf-7b65-4cff-9f24-76f1a7ec5149" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_RU_fa54735b-0c73-49ce-b35d-8af27afd7592" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_RU"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6d7709bf-7b65-4cff-9f24-76f1a7ec5149" xlink:to="loc_country_RU_fa54735b-0c73-49ce-b35d-8af27afd7592" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_2246ccc9-9758-487e-a525-7c49e9921d42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:to="loc_us-gaap_VariableRateDomain_2246ccc9-9758-487e-a525-7c49e9921d42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:to="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_SterlingOvernightIndexAverageReferenceRateMember_0661a99c-c4b9-4811-9159-1c8611ab016e" xlink:href="flt-20220930.xsd#flt_SterlingOvernightIndexAverageReferenceRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:to="loc_flt_SterlingOvernightIndexAverageReferenceRateMember_0661a99c-c4b9-4811-9159-1c8611ab016e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_EuroShortTermRateMember_800a4c1e-e79d-47f2-a811-91a87be5a118" xlink:href="flt-20220930.xsd#flt_EuroShortTermRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:to="loc_flt_EuroShortTermRateMember_800a4c1e-e79d-47f2-a811-91a87be5a118" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_d503205c-9696-45a5-aac5-e52b365a5e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_d503205c-9696-45a5-aac5-e52b365a5e2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_f95eb464-ad49-465f-ace2-ef454e40ba9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_f95eb464-ad49-465f-ace2-ef454e40ba9f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails_1" xlink:type="simple" xlink:href="flt-20220930.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails_1" xlink:type="extended" id="ic834644882854e38bc7c13866d0b5dee_SummaryofSignificantAccountingPoliciesNarrativeDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_8824dfc2-8835-4d52-849b-20f2272ad3f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_Cash_8824dfc2-8835-4d52-849b-20f2272ad3f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_39d04775-a801-40fc-ba4a-31606f4c170d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_39d04775-a801-40fc-ba4a-31606f4c170d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_d7b1626d-d4ac-4fe9-9aea-6840d4c8f92c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_ContractWithCustomerLiability_d7b1626d-d4ac-4fe9-9aea-6840d4c8f92c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_83b91a45-a12d-41c1-9bf7-35a387d81601" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_83b91a45-a12d-41c1-9bf7-35a387d81601" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2fcee442-cb87-4628-a9dc-3859bc72ce06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2fcee442-cb87-4628-a9dc-3859bc72ce06" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_d578d53d-d0f9-48b6-a6e1-e87d99022200" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_d578d53d-d0f9-48b6-a6e1-e87d99022200" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_a8b9f7d6-a539-4e21-b6cd-fd759b7d5e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_a8b9f7d6-a539-4e21-b6cd-fd759b7d5e2d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_ab65f83e-c9a5-4b87-a0a5-7a9e1e27e98c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_ab65f83e-c9a5-4b87-a0a5-7a9e1e27e98c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe430b83-5af5-40ca-b038-568cfbadb859" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe430b83-5af5-40ca-b038-568cfbadb859" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeBasisSpreadOnVariableRate_23cb6213-f46f-4a7b-8864-9150fd3f0450" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeBasisSpreadOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_DerivativeBasisSpreadOnVariableRate_23cb6213-f46f-4a7b-8864-9150fd3f0450" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fcc713b2-9a97-4d9f-a611-37f234281a7a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_09f7a0b8-81c2-428f-926e-01688d022f91_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:to="loc_srt_ProductsAndServicesDomain_09f7a0b8-81c2-428f-926e-01688d022f91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a292224d-611a-462d-a3fe-4d3a73bfe62e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_09f7a0b8-81c2-428f-926e-01688d022f91" xlink:to="loc_srt_ProductsAndServicesDomain_a292224d-611a-462d-a3fe-4d3a73bfe62e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ContractswithCustomersMember_d77a504d-5e3c-46cb-a75b-02e706649e47" xlink:href="flt-20220930.xsd#flt_ContractswithCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a292224d-611a-462d-a3fe-4d3a73bfe62e" xlink:to="loc_flt_ContractswithCustomersMember_d77a504d-5e3c-46cb-a75b-02e706649e47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_7707c510-0360-42e5-94a7-a6ffe9975d5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_7707c510-0360-42e5-94a7-a6ffe9975d5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_dc6dcbed-6afd-4a8b-9484-57b111e34690" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7707c510-0360-42e5-94a7-a6ffe9975d5d" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_dc6dcbed-6afd-4a8b-9484-57b111e34690" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_9e790812-9059-420a-86f5-f8ce05a51dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_dc6dcbed-6afd-4a8b-9484-57b111e34690" xlink:to="loc_us-gaap_SalesRevenueNetMember_9e790812-9059-420a-86f5-f8ce05a51dd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b8863ab6-a712-4873-a64c-e4bb2c9b1871_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b8863ab6-a712-4873-a64c-e4bb2c9b1871_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b201a71d-073a-462a-af2a-2a77df657aaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b8863ab6-a712-4873-a64c-e4bb2c9b1871" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b201a71d-073a-462a-af2a-2a77df657aaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_8a97f649-2476-4c4e-8bf9-fda02faa5b50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_b201a71d-073a-462a-af2a-2a77df657aaa" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_8a97f649-2476-4c4e-8bf9-fda02faa5b50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_bafad68b-c858-48ce-9b30-3ba41738c187_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:to="loc_srt_RestatementDomain_bafad68b-c858-48ce-9b30-3ba41738c187_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_1e28e725-9775-41a1-913b-437654ff6f6c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_bafad68b-c858-48ce-9b30-3ba41738c187" xlink:to="loc_srt_RestatementDomain_1e28e725-9775-41a1-913b-437654ff6f6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_53f5c15d-5fff-4205-b116-03382f6f11bd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_1e28e725-9775-41a1-913b-437654ff6f6c" xlink:to="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_53f5c15d-5fff-4205-b116-03382f6f11bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_6ee067fd-04cc-4369-b9bf-9506be57a4ba_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:to="loc_srt_SegmentGeographicalDomain_6ee067fd-04cc-4369-b9bf-9506be57a4ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_6d7709bf-7b65-4cff-9f24-76f1a7ec5149" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_6ee067fd-04cc-4369-b9bf-9506be57a4ba" xlink:to="loc_srt_SegmentGeographicalDomain_6d7709bf-7b65-4cff-9f24-76f1a7ec5149" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_RU_fa54735b-0c73-49ce-b35d-8af27afd7592" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_RU"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6d7709bf-7b65-4cff-9f24-76f1a7ec5149" xlink:to="loc_country_RU_fa54735b-0c73-49ce-b35d-8af27afd7592" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_04eb34d4-5f2d-4796-a2b6-4770cd7bf388" xlink:to="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_2246ccc9-9758-487e-a525-7c49e9921d42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:to="loc_us-gaap_VariableRateDomain_2246ccc9-9758-487e-a525-7c49e9921d42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_2246ccc9-9758-487e-a525-7c49e9921d42" xlink:to="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_SterlingOvernightIndexAverageReferenceRateMember_0661a99c-c4b9-4811-9159-1c8611ab016e" xlink:href="flt-20220930.xsd#flt_SterlingOvernightIndexAverageReferenceRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:to="loc_flt_SterlingOvernightIndexAverageReferenceRateMember_0661a99c-c4b9-4811-9159-1c8611ab016e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_EuroShortTermRateMember_800a4c1e-e79d-47f2-a811-91a87be5a118" xlink:href="flt-20220930.xsd#flt_EuroShortTermRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:to="loc_flt_EuroShortTermRateMember_800a4c1e-e79d-47f2-a811-91a87be5a118" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_d503205c-9696-45a5-aac5-e52b365a5e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_998be9ad-508b-4557-a36e-050a12079ae1" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_d503205c-9696-45a5-aac5-e52b365a5e2f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#SummaryofSignificantAccountingPoliciesDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesDisaggregationofRevenueDetails" xlink:type="extended" id="i6e41b3a9efd046909d08d762dbd1e933_SummaryofSignificantAccountingPoliciesDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_7eebe6ed-df25-48af-866d-e70f19fa649c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_ca6c921f-9e85-45b5-a40b-c65591363502" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_7eebe6ed-df25-48af-866d-e70f19fa649c" xlink:to="loc_us-gaap_Revenues_ca6c921f-9e85-45b5-a40b-c65591363502" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_cdb9c799-bcca-4492-b5a7-6c21731aa90e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_7eebe6ed-df25-48af-866d-e70f19fa649c" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_cdb9c799-bcca-4492-b5a7-6c21731aa90e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_0904a3fc-c00b-4bb7-b423-7ba62626dac4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_7eebe6ed-df25-48af-866d-e70f19fa649c" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_0904a3fc-c00b-4bb7-b423-7ba62626dac4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_8cc58af4-9d61-4d82-903c-5bc2be2a3ab0" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0904a3fc-c00b-4bb7-b423-7ba62626dac4" xlink:to="loc_srt_ProductOrServiceAxis_8cc58af4-9d61-4d82-903c-5bc2be2a3ab0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_8cc58af4-9d61-4d82-903c-5bc2be2a3ab0_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_8cc58af4-9d61-4d82-903c-5bc2be2a3ab0" xlink:to="loc_srt_ProductsAndServicesDomain_8cc58af4-9d61-4d82-903c-5bc2be2a3ab0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_8cc58af4-9d61-4d82-903c-5bc2be2a3ab0" xlink:to="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_FuelCardsMember_556ef642-c3d2-4e6b-a9c6-d7facd2095e4" xlink:href="flt-20220930.xsd#flt_FuelCardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:to="loc_flt_FuelCardsMember_556ef642-c3d2-4e6b-a9c6-d7facd2095e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_CorporatePaymentsMember_f8ae1765-a8ca-4163-832b-439025e83257" xlink:href="flt-20220930.xsd#flt_CorporatePaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:to="loc_flt_CorporatePaymentsMember_f8ae1765-a8ca-4163-832b-439025e83257" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_TollsMember_0bd23e6b-8bb3-45f3-92dc-43eea84fc0a7" xlink:href="flt-20220930.xsd#flt_TollsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:to="loc_flt_TollsMember_0bd23e6b-8bb3-45f3-92dc-43eea84fc0a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_LodgingMember_3cc35125-5635-4e71-b999-8e6acd614def" xlink:href="flt-20220930.xsd#flt_LodgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:to="loc_flt_LodgingMember_3cc35125-5635-4e71-b999-8e6acd614def" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_GiftMember_b613c62f-8973-4d39-8b00-f57dbe2f4409" xlink:href="flt-20220930.xsd#flt_GiftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:to="loc_flt_GiftMember_b613c62f-8973-4d39-8b00-f57dbe2f4409" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_OtherMember_c22a1187-6361-4d2e-8f2f-c624d4f303ef" xlink:href="flt-20220930.xsd#flt_OtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bc1ddcb4-cdb3-43e5-a792-1a2acef966e1" xlink:to="loc_flt_OtherMember_c22a1187-6361-4d2e-8f2f-c624d4f303ef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_ed4bdea9-dc2d-4804-8190-77de60c70ded" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0904a3fc-c00b-4bb7-b423-7ba62626dac4" xlink:to="loc_srt_StatementGeographicalAxis_ed4bdea9-dc2d-4804-8190-77de60c70ded" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_ed4bdea9-dc2d-4804-8190-77de60c70ded_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_ed4bdea9-dc2d-4804-8190-77de60c70ded" xlink:to="loc_srt_SegmentGeographicalDomain_ed4bdea9-dc2d-4804-8190-77de60c70ded_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_6fbd7b8d-c3d5-4b11-bd00-6a903630c1bd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_ed4bdea9-dc2d-4804-8190-77de60c70ded" xlink:to="loc_srt_SegmentGeographicalDomain_6fbd7b8d-c3d5-4b11-bd00-6a903630c1bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_5223e112-8952-4bb6-95c8-b594d3c63207" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6fbd7b8d-c3d5-4b11-bd00-6a903630c1bd" xlink:to="loc_country_US_5223e112-8952-4bb6-95c8-b594d3c63207" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_BR_b1511d2d-28cb-4cd6-bf69-141fc8015360" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_BR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6fbd7b8d-c3d5-4b11-bd00-6a903630c1bd" xlink:to="loc_country_BR_b1511d2d-28cb-4cd6-bf69-141fc8015360" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_53f3b8e5-28ee-4606-96c7-d91121a7b136" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6fbd7b8d-c3d5-4b11-bd00-6a903630c1bd" xlink:to="loc_country_GB_53f3b8e5-28ee-4606-96c7-d91121a7b136" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_OtherCountriesMember_12f2c137-fff2-45c6-88e8-5e71229015f9" xlink:href="flt-20220930.xsd#flt_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_6fbd7b8d-c3d5-4b11-bd00-6a903630c1bd" xlink:to="loc_flt_OtherCountriesMember_12f2c137-fff2-45c6-88e8-5e71229015f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1b9293f4-6d30-4685-ae5b-ed7c735e44c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0904a3fc-c00b-4bb7-b423-7ba62626dac4" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1b9293f4-6d30-4685-ae5b-ed7c735e44c4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1b9293f4-6d30-4685-ae5b-ed7c735e44c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1b9293f4-6d30-4685-ae5b-ed7c735e44c4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1b9293f4-6d30-4685-ae5b-ed7c735e44c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ed51b2e6-e18c-448c-9d59-cce15d1a424b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1b9293f4-6d30-4685-ae5b-ed7c735e44c4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ed51b2e6-e18c-448c-9d59-cce15d1a424b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_ac0ef899-47f1-437f-b68d-2caca1d0e11c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ed51b2e6-e18c-448c-9d59-cce15d1a424b" xlink:to="loc_us-gaap_SalesRevenueNetMember_ac0ef899-47f1-437f-b68d-2caca1d0e11c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_bd8048d9-8472-450e-8f4f-d6260f983f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0904a3fc-c00b-4bb7-b423-7ba62626dac4" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_bd8048d9-8472-450e-8f4f-d6260f983f2b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_bd8048d9-8472-450e-8f4f-d6260f983f2b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_bd8048d9-8472-450e-8f4f-d6260f983f2b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_bd8048d9-8472-450e-8f4f-d6260f983f2b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_1a7defc3-08b6-43ac-9304-e9f3d7867894" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_bd8048d9-8472-450e-8f4f-d6260f983f2b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_1a7defc3-08b6-43ac-9304-e9f3d7867894" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_f62a7544-f5bf-45bd-9bab-124800948205" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_1a7defc3-08b6-43ac-9304-e9f3d7867894" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_f62a7544-f5bf-45bd-9bab-124800948205" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_83009701-7b03-4694-bea6-25f028922a53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_1a7defc3-08b6-43ac-9304-e9f3d7867894" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_83009701-7b03-4694-bea6-25f028922a53" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesScheduleofSpotTradesDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#SummaryofSignificantAccountingPoliciesScheduleofSpotTradesDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/SummaryofSignificantAccountingPoliciesScheduleofSpotTradesDetails" xlink:type="extended" id="i4841a8f256364ace8af631ad462d209a_SummaryofSignificantAccountingPoliciesScheduleofSpotTradesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_1e53d7ec-04ff-458a-854c-cb90bc45cd66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_c3a0163c-7b70-481a-81c6-eb193fe30b95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_1e53d7ec-04ff-458a-854c-cb90bc45cd66" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_c3a0163c-7b70-481a-81c6-eb193fe30b95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_f9922768-ed46-42c3-a999-75ba949b19c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_c3a0163c-7b70-481a-81c6-eb193fe30b95" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_f9922768-ed46-42c3-a999-75ba949b19c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_08977b70-0baf-4c01-bb58-d33eadb4bccd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_c3a0163c-7b70-481a-81c6-eb193fe30b95" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_08977b70-0baf-4c01-bb58-d33eadb4bccd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_5938891f-94ba-473b-872c-810348e6fda4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_c3a0163c-7b70-481a-81c6-eb193fe30b95" xlink:to="loc_us-gaap_DerivativeAssets_5938891f-94ba-473b-872c-810348e6fda4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_5de8a34e-0804-4173-922d-9b84be3f61ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_c3a0163c-7b70-481a-81c6-eb193fe30b95" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_5de8a34e-0804-4173-922d-9b84be3f61ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_ba811b24-f34a-4d72-9792-784cde28e498" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_1e53d7ec-04ff-458a-854c-cb90bc45cd66" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_ba811b24-f34a-4d72-9792-784cde28e498" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_28f5e0aa-428a-43e1-85f2-02438692f210" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_ba811b24-f34a-4d72-9792-784cde28e498" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_28f5e0aa-428a-43e1-85f2-02438692f210" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_9cebb038-23e4-417d-ac17-fff81f1ffa9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_ba811b24-f34a-4d72-9792-784cde28e498" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_9cebb038-23e4-417d-ac17-fff81f1ffa9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_14805e75-4f68-483d-9968-d737efd4149b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_ba811b24-f34a-4d72-9792-784cde28e498" xlink:to="loc_us-gaap_DerivativeLiabilities_14805e75-4f68-483d-9968-d737efd4149b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_826ffb15-7a9e-4261-bfe0-0518d13aadc9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_ba811b24-f34a-4d72-9792-784cde28e498" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_826ffb15-7a9e-4261-bfe0-0518d13aadc9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_35c10f5b-1261-4efa-bc24-b3e2a1b3ab4f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_1e53d7ec-04ff-458a-854c-cb90bc45cd66" xlink:to="loc_us-gaap_DerivativeTable_35c10f5b-1261-4efa-bc24-b3e2a1b3ab4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_426222f0-9a5f-4ce5-adba-cb621f66e49b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_35c10f5b-1261-4efa-bc24-b3e2a1b3ab4f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_426222f0-9a5f-4ce5-adba-cb621f66e49b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_426222f0-9a5f-4ce5-adba-cb621f66e49b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_426222f0-9a5f-4ce5-adba-cb621f66e49b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_426222f0-9a5f-4ce5-adba-cb621f66e49b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_bb4f95c5-0f0b-44ff-8162-32f162a09331" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_426222f0-9a5f-4ce5-adba-cb621f66e49b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_bb4f95c5-0f0b-44ff-8162-32f162a09331" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_SpotTradeMember_e876d3ff-d2f1-4f80-adb1-eb2a66e1f0f1" xlink:href="flt-20220930.xsd#flt_SpotTradeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bb4f95c5-0f0b-44ff-8162-32f162a09331" xlink:to="loc_flt_SpotTradeMember_e876d3ff-d2f1-4f80-adb1-eb2a66e1f0f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_6e466077-d3b8-4412-abd4-a3b30dd90f38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_35c10f5b-1261-4efa-bc24-b3e2a1b3ab4f" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_6e466077-d3b8-4412-abd4-a3b30dd90f38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_6e466077-d3b8-4412-abd4-a3b30dd90f38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6e466077-d3b8-4412-abd4-a3b30dd90f38" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_6e466077-d3b8-4412-abd4-a3b30dd90f38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_3d4cb362-b9dd-4b3a-b43a-13d1b48dbfd9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6e466077-d3b8-4412-abd4-a3b30dd90f38" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_3d4cb362-b9dd-4b3a-b43a-13d1b48dbfd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableMember_c6df701d-95ca-4297-8121-8d2495011816" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_3d4cb362-b9dd-4b3a-b43a-13d1b48dbfd9" xlink:to="loc_us-gaap_AccountsPayableMember_c6df701d-95ca-4297-8121-8d2495011816" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_804a2874-9986-4c61-a04b-e8577a8c3953" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_3d4cb362-b9dd-4b3a-b43a-13d1b48dbfd9" xlink:to="loc_us-gaap_AccountsReceivableMember_804a2874-9986-4c61-a04b-e8577a8c3953" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/AccountsandOtherReceivablesCompanysAccountsReceivableandSecuritizedAccountsReceivableDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#AccountsandOtherReceivablesCompanysAccountsReceivableandSecuritizedAccountsReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/AccountsandOtherReceivablesCompanysAccountsReceivableandSecuritizedAccountsReceivableDetails" xlink:type="extended" id="i34ca751299814cd3b2d6511bc635c9cd_AccountsandOtherReceivablesCompanysAccountsReceivableandSecuritizedAccountsReceivableDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_bebf2e5b-b4c4-4016-b878-c3877138b42a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_6bce5e06-6a56-4352-8ac4-918b3fc7f318" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_bebf2e5b-b4c4-4016-b878-c3877138b42a" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_6bce5e06-6a56-4352-8ac4-918b3fc7f318" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_ee96a319-c662-4b9d-929d-3748decdc8ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_bebf2e5b-b4c4-4016-b878-c3877138b42a" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_ee96a319-c662-4b9d-929d-3748decdc8ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableNetCurrent_43618a24-1a47-4a41-b9bd-5aeda4f8d6c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsNotesAndLoansReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_bebf2e5b-b4c4-4016-b878-c3877138b42a" xlink:to="loc_us-gaap_AccountsNotesAndLoansReceivableNetCurrent_43618a24-1a47-4a41-b9bd-5aeda4f8d6c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_0ba2ba34-3eb5-493a-951a-cf60482e0b31" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_bebf2e5b-b4c4-4016-b878-c3877138b42a" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_0ba2ba34-3eb5-493a-951a-cf60482e0b31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_f503c444-64ba-4017-87f8-82985ad38f81" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_0ba2ba34-3eb5-493a-951a-cf60482e0b31" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_f503c444-64ba-4017-87f8-82985ad38f81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_f503c444-64ba-4017-87f8-82985ad38f81_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_f503c444-64ba-4017-87f8-82985ad38f81" xlink:to="loc_us-gaap_ReceivableTypeDomain_f503c444-64ba-4017-87f8-82985ad38f81_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_c5fb9b6b-3573-458e-a02e-37e46718deea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_f503c444-64ba-4017-87f8-82985ad38f81" xlink:to="loc_us-gaap_ReceivableTypeDomain_c5fb9b6b-3573-458e-a02e-37e46718deea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_AccountsReceivableDomesticMember_8d091be2-2bf6-4172-8c32-1f63aa817e2a" xlink:href="flt-20220930.xsd#flt_AccountsReceivableDomesticMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_c5fb9b6b-3573-458e-a02e-37e46718deea" xlink:to="loc_flt_AccountsReceivableDomesticMember_8d091be2-2bf6-4172-8c32-1f63aa817e2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_GrossDomesticSecuritizedAccountsReceivableMember_6c8292e1-962f-4cf2-832b-c902a70d36be" xlink:href="flt-20220930.xsd#flt_GrossDomesticSecuritizedAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_c5fb9b6b-3573-458e-a02e-37e46718deea" xlink:to="loc_flt_GrossDomesticSecuritizedAccountsReceivableMember_6c8292e1-962f-4cf2-832b-c902a70d36be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_AccountsReceivableForeignMember_d9ed8491-d3a5-4159-a753-871145183170" xlink:href="flt-20220930.xsd#flt_AccountsReceivableForeignMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_c5fb9b6b-3573-458e-a02e-37e46718deea" xlink:to="loc_flt_AccountsReceivableForeignMember_d9ed8491-d3a5-4159-a753-871145183170" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/AccountsandOtherReceivablesNarrativeDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#AccountsandOtherReceivablesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/AccountsandOtherReceivablesNarrativeDetails" xlink:type="extended" id="ia78e8cbf04574611b7644854c05105d3_AccountsandOtherReceivablesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_666cc05c-d9dd-40fc-8cbb-5d2f667482f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c921c113-6c3d-4038-8d20-463418d382fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_666cc05c-d9dd-40fc-8cbb-5d2f667482f8" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c921c113-6c3d-4038-8d20-463418d382fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_bd51cea4-9bc1-47e0-b639-9d1147c8ecf9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_666cc05c-d9dd-40fc-8cbb-5d2f667482f8" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_bd51cea4-9bc1-47e0-b639-9d1147c8ecf9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_98419bc5-b45c-41c6-8b59-0d73300063ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_bd51cea4-9bc1-47e0-b639-9d1147c8ecf9" xlink:to="loc_us-gaap_DebtInstrumentAxis_98419bc5-b45c-41c6-8b59-0d73300063ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_98419bc5-b45c-41c6-8b59-0d73300063ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_98419bc5-b45c-41c6-8b59-0d73300063ab" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_98419bc5-b45c-41c6-8b59-0d73300063ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3ea97ee7-4274-4df9-94fa-d0dbdb88150b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_98419bc5-b45c-41c6-8b59-0d73300063ab" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3ea97ee7-4274-4df9-94fa-d0dbdb88150b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ReceivablesSecuritizationFacilityMember_f082c7c0-737c-484e-bf36-1fac00dc8cfc" xlink:href="flt-20220930.xsd#flt_ReceivablesSecuritizationFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3ea97ee7-4274-4df9-94fa-d0dbdb88150b" xlink:to="loc_flt_ReceivablesSecuritizationFacilityMember_f082c7c0-737c-484e-bf36-1fac00dc8cfc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/FairValueMeasurementsFinancialAssetsandLiabilitiesMeasuredatFairValueDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#FairValueMeasurementsFinancialAssetsandLiabilitiesMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/FairValueMeasurementsFinancialAssetsandLiabilitiesMeasuredatFairValueDetails" xlink:type="extended" id="i7c76fea122d04c82953c85aa9370fbd3_FairValueMeasurementsFinancialAssetsandLiabilitiesMeasuredatFairValueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_695f21ba-6e74-47db-81b9-458d1c2555d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_a32c286c-50c9-4db5-82b9-1c063dadfc4b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_695f21ba-6e74-47db-81b9-458d1c2555d5" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_a32c286c-50c9-4db5-82b9-1c063dadfc4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_de0ddf34-9b38-4178-a5e4-1c910dfeac40" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_a32c286c-50c9-4db5-82b9-1c063dadfc4b" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_de0ddf34-9b38-4178-a5e4-1c910dfeac40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_9c4a0e00-fd58-4a5a-aa24-a50496a80d20" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_a32c286c-50c9-4db5-82b9-1c063dadfc4b" xlink:to="loc_us-gaap_DerivativeAssets_9c4a0e00-fd58-4a5a-aa24-a50496a80d20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_aa517ab1-46c4-482e-93ff-577de6da3d17" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_a32c286c-50c9-4db5-82b9-1c063dadfc4b" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_aa517ab1-46c4-482e-93ff-577de6da3d17" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_50677d6a-a101-4764-8361-4eb7f2201c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeCollateralObligationToReturnCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_695f21ba-6e74-47db-81b9-458d1c2555d5" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_50677d6a-a101-4764-8361-4eb7f2201c3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_ff366938-456f-477f-a696-93614e6e4e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_695f21ba-6e74-47db-81b9-458d1c2555d5" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_ff366938-456f-477f-a696-93614e6e4e6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_cadda7b3-8d13-4afb-8163-3e55f4de9c53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_ff366938-456f-477f-a696-93614e6e4e6b" xlink:to="loc_us-gaap_DerivativeLiabilities_cadda7b3-8d13-4afb-8163-3e55f4de9c53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_8bdb0bdf-e8f9-4b27-ab1c-b1404339cfad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_ff366938-456f-477f-a696-93614e6e4e6b" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_8bdb0bdf-e8f9-4b27-ab1c-b1404339cfad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_66892b3e-eac4-4a55-a9ad-e5b4dae60d45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeCollateralRightToReclaimCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_695f21ba-6e74-47db-81b9-458d1c2555d5" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_66892b3e-eac4-4a55-a9ad-e5b4dae60d45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_deb9cf95-8995-48fe-a46e-ea7583f569b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_695f21ba-6e74-47db-81b9-458d1c2555d5" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_deb9cf95-8995-48fe-a46e-ea7583f569b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ae562bf3-dad1-456a-8195-a5c1a3ba205c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_deb9cf95-8995-48fe-a46e-ea7583f569b4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ae562bf3-dad1-456a-8195-a5c1a3ba205c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ae562bf3-dad1-456a-8195-a5c1a3ba205c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ae562bf3-dad1-456a-8195-a5c1a3ba205c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ae562bf3-dad1-456a-8195-a5c1a3ba205c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_00206e30-0563-4ad9-a3c8-a802ae48adbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ae562bf3-dad1-456a-8195-a5c1a3ba205c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_00206e30-0563-4ad9-a3c8-a802ae48adbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_868119cf-2685-40de-983f-af8f0bed1b98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_00206e30-0563-4ad9-a3c8-a802ae48adbe" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_868119cf-2685-40de-983f-af8f0bed1b98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_d064c145-bee7-4bd9-b0b5-c340ef5dcac4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_00206e30-0563-4ad9-a3c8-a802ae48adbe" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_d064c145-bee7-4bd9-b0b5-c340ef5dcac4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_81b6d094-63c4-40a4-9be3-cceedb6d7ed3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_00206e30-0563-4ad9-a3c8-a802ae48adbe" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_81b6d094-63c4-40a4-9be3-cceedb6d7ed3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_142f01f9-79f7-43bd-b076-fa87bf935349" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_deb9cf95-8995-48fe-a46e-ea7583f569b4" xlink:to="loc_us-gaap_InvestmentTypeAxis_142f01f9-79f7-43bd-b076-fa87bf935349" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_142f01f9-79f7-43bd-b076-fa87bf935349_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_142f01f9-79f7-43bd-b076-fa87bf935349" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_142f01f9-79f7-43bd-b076-fa87bf935349_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_f73eb9dd-db4d-47ec-90e4-20f692bb0a2b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_142f01f9-79f7-43bd-b076-fa87bf935349" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_f73eb9dd-db4d-47ec-90e4-20f692bb0a2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepurchaseAgreementsMember_e794d358-71b6-456c-a988-a19e29d094c7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepurchaseAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_f73eb9dd-db4d-47ec-90e4-20f692bb0a2b" xlink:to="loc_us-gaap_RepurchaseAgreementsMember_e794d358-71b6-456c-a988-a19e29d094c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_MoneyMarketsMember_b019800c-34bb-4669-90ff-a55f8fe9b7ac" xlink:href="flt-20220930.xsd#flt_MoneyMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_f73eb9dd-db4d-47ec-90e4-20f692bb0a2b" xlink:to="loc_flt_MoneyMarketsMember_b019800c-34bb-4669-90ff-a55f8fe9b7ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_8c9c72cb-39e1-4dd8-93cc-796794321fee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_f73eb9dd-db4d-47ec-90e4-20f692bb0a2b" xlink:to="loc_us-gaap_CertificatesOfDepositMember_8c9c72cb-39e1-4dd8-93cc-796794321fee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_a9e3e2aa-775f-434f-856c-798831aec07b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_deb9cf95-8995-48fe-a46e-ea7583f569b4" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_a9e3e2aa-775f-434f-856c-798831aec07b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_a9e3e2aa-775f-434f-856c-798831aec07b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_a9e3e2aa-775f-434f-856c-798831aec07b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_a9e3e2aa-775f-434f-856c-798831aec07b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_30f6f6ea-29cc-4c03-92c7-ea8f0852a55a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_a9e3e2aa-775f-434f-856c-798831aec07b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_30f6f6ea-29cc-4c03-92c7-ea8f0852a55a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_674f711e-edb5-4871-bf2f-ad2183940971" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_30f6f6ea-29cc-4c03-92c7-ea8f0852a55a" xlink:to="loc_us-gaap_InterestRateSwapMember_674f711e-edb5-4871-bf2f-ad2183940971" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_774e7779-5678-4e3b-86d0-b3e3e11d0881" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_30f6f6ea-29cc-4c03-92c7-ea8f0852a55a" xlink:to="loc_us-gaap_ForeignExchangeContractMember_774e7779-5678-4e3b-86d0-b3e3e11d0881" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/StockholdersEquityRepurchaseProgramDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#StockholdersEquityRepurchaseProgramDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/StockholdersEquityRepurchaseProgramDetails" xlink:type="extended" id="i4c763da6322140b78a0a63abf4897702_StockholdersEquityRepurchaseProgramDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_4b8830bd-947a-4fa7-9988-7475c5d57515" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_StockRepurchaseProgramIncreaseInAuthorizedAmount_2f5ddd0f-0726-4d4b-bea5-916bf11d2a1a" xlink:href="flt-20220930.xsd#flt_StockRepurchaseProgramIncreaseInAuthorizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_4b8830bd-947a-4fa7-9988-7475c5d57515" xlink:to="loc_flt_StockRepurchaseProgramIncreaseInAuthorizedAmount_2f5ddd0f-0726-4d4b-bea5-916bf11d2a1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_fdd6d1f6-ede6-4871-aaef-c10e9941070c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_4b8830bd-947a-4fa7-9988-7475c5d57515" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_fdd6d1f6-ede6-4871-aaef-c10e9941070c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_b3a30fc8-76c7-4b32-ad4b-ef45676a269b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_4b8830bd-947a-4fa7-9988-7475c5d57515" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_b3a30fc8-76c7-4b32-ad4b-ef45676a269b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_53189b5e-874c-4725-a8d0-48d4d97a1d63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_4b8830bd-947a-4fa7-9988-7475c5d57515" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_53189b5e-874c-4725-a8d0-48d4d97a1d63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_c7ec6f63-12e3-4bfb-8230-23c67313c4a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_4b8830bd-947a-4fa7-9988-7475c5d57515" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_c7ec6f63-12e3-4bfb-8230-23c67313c4a9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_0d1d4d64-30dd-402c-b947-eda301fcf76c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_4b8830bd-947a-4fa7-9988-7475c5d57515" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_0d1d4d64-30dd-402c-b947-eda301fcf76c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_1ea04a22-50b8-408c-88df-4c2796c16699" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_0d1d4d64-30dd-402c-b947-eda301fcf76c" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_1ea04a22-50b8-408c-88df-4c2796c16699" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_1ea04a22-50b8-408c-88df-4c2796c16699_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_1ea04a22-50b8-408c-88df-4c2796c16699" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_1ea04a22-50b8-408c-88df-4c2796c16699_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_99ed716a-dd76-4708-808b-97661d955a07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_1ea04a22-50b8-408c-88df-4c2796c16699" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_99ed716a-dd76-4708-808b-97661d955a07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ProgramMember_d6c40dfb-4179-4792-b53e-cc41de4683da" xlink:href="flt-20220930.xsd#flt_ProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_99ed716a-dd76-4708-808b-97661d955a07" xlink:to="loc_flt_ProgramMember_d6c40dfb-4179-4792-b53e-cc41de4683da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_21c7fb49-5bfa-4d16-b26a-bd046c3c31ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_0d1d4d64-30dd-402c-b947-eda301fcf76c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_21c7fb49-5bfa-4d16-b26a-bd046c3c31ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_21c7fb49-5bfa-4d16-b26a-bd046c3c31ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_21c7fb49-5bfa-4d16-b26a-bd046c3c31ff" xlink:to="loc_us-gaap_ClassOfStockDomain_21c7fb49-5bfa-4d16-b26a-bd046c3c31ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f7266c28-2edc-47a0-853c-015ee1c5b3a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_21c7fb49-5bfa-4d16-b26a-bd046c3c31ff" xlink:to="loc_us-gaap_ClassOfStockDomain_f7266c28-2edc-47a0-853c-015ee1c5b3a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_3e3ee303-59cf-4f22-bda5-7955ddb54860" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f7266c28-2edc-47a0-853c-015ee1c5b3a3" xlink:to="loc_us-gaap_CommonStockMember_3e3ee303-59cf-4f22-bda5-7955ddb54860" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_798fc12d-3e42-4d99-b249-2f3737d75bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_0d1d4d64-30dd-402c-b947-eda301fcf76c" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_798fc12d-3e42-4d99-b249-2f3737d75bdb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_798fc12d-3e42-4d99-b249-2f3737d75bdb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_798fc12d-3e42-4d99-b249-2f3737d75bdb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_798fc12d-3e42-4d99-b249-2f3737d75bdb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_ee67c50e-eb0e-49f1-9437-878b12b4683c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_798fc12d-3e42-4d99-b249-2f3737d75bdb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_ee67c50e-eb0e-49f1-9437-878b12b4683c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_8e993a6b-c40a-49e7-9133-38119d0a474c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_ee67c50e-eb0e-49f1-9437-878b12b4683c" xlink:to="loc_us-gaap_SubsequentEventMember_8e993a6b-c40a-49e7-9133-38119d0a474c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/StockBasedCompensationSummaryofExpenseRelatedtoShareBasedPaymentsDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#StockBasedCompensationSummaryofExpenseRelatedtoShareBasedPaymentsDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/StockBasedCompensationSummaryofExpenseRelatedtoShareBasedPaymentsDetails" xlink:type="extended" id="i9aced748ea0442c3a900518daa41ce8e_StockBasedCompensationSummaryofExpenseRelatedtoShareBasedPaymentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697517e9-7a9a-4ec2-913b-f34b9636103e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_d306a86f-1edb-43ca-9095-0875e435a6ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697517e9-7a9a-4ec2-913b-f34b9636103e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_d306a86f-1edb-43ca-9095-0875e435a6ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_00c76d6e-0b31-467d-885e-4ad53f6c786b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697517e9-7a9a-4ec2-913b-f34b9636103e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_00c76d6e-0b31-467d-885e-4ad53f6c786b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_a3857c77-e457-4aef-b705-c3a6cdcd3ba7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_00c76d6e-0b31-467d-885e-4ad53f6c786b" xlink:to="loc_us-gaap_AwardTypeAxis_a3857c77-e457-4aef-b705-c3a6cdcd3ba7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a3857c77-e457-4aef-b705-c3a6cdcd3ba7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_a3857c77-e457-4aef-b705-c3a6cdcd3ba7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a3857c77-e457-4aef-b705-c3a6cdcd3ba7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5955c17e-fb4b-4f61-8b5d-445f30bc4d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_a3857c77-e457-4aef-b705-c3a6cdcd3ba7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5955c17e-fb4b-4f61-8b5d-445f30bc4d1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_7639935d-0e2b-4bed-85b0-04d816e41b02" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5955c17e-fb4b-4f61-8b5d-445f30bc4d1b" xlink:to="loc_us-gaap_EmployeeStockOptionMember_7639935d-0e2b-4bed-85b0-04d816e41b02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_3c911e6a-4731-4bec-b209-aa331c42b6c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5955c17e-fb4b-4f61-8b5d-445f30bc4d1b" xlink:to="loc_us-gaap_RestrictedStockMember_3c911e6a-4731-4bec-b209-aa331c42b6c3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended" id="ibe2a05cffe184ffcb21ff4d27f88a920_StockBasedCompensationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82f11172-6e97-40f4-b4a5-34f27538335f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_0ea5c18d-6bc1-4d26-b98c-f5e61da2eb1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82f11172-6e97-40f4-b4a5-34f27538335f" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_0ea5c18d-6bc1-4d26-b98c-f5e61da2eb1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_03e46999-ed04-4bde-838c-0c6355a80357" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82f11172-6e97-40f4-b4a5-34f27538335f" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_03e46999-ed04-4bde-838c-0c6355a80357" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_ffe0dedf-9691-4860-8782-0b9c8c989320" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82f11172-6e97-40f4-b4a5-34f27538335f" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_ffe0dedf-9691-4860-8782-0b9c8c989320" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_50aa14d3-4e59-47a8-a14f-25b0b5b76ac5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82f11172-6e97-40f4-b4a5-34f27538335f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_50aa14d3-4e59-47a8-a14f-25b0b5b76ac5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_7f55a7a8-bf80-4bd1-aaf0-7a249e61233b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_50aa14d3-4e59-47a8-a14f-25b0b5b76ac5" xlink:to="loc_us-gaap_AwardTypeAxis_7f55a7a8-bf80-4bd1-aaf0-7a249e61233b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f55a7a8-bf80-4bd1-aaf0-7a249e61233b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7f55a7a8-bf80-4bd1-aaf0-7a249e61233b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f55a7a8-bf80-4bd1-aaf0-7a249e61233b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7586f802-52b8-4326-845e-97df1e1311e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7f55a7a8-bf80-4bd1-aaf0-7a249e61233b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7586f802-52b8-4326-845e-97df1e1311e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_46cc649d-ff6c-47d2-96b2-1c88cdb4030a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7586f802-52b8-4326-845e-97df1e1311e9" xlink:to="loc_us-gaap_EmployeeStockOptionMember_46cc649d-ff6c-47d2-96b2-1c88cdb4030a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_ed389d51-d874-4628-83af-7392304bc631" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7586f802-52b8-4326-845e-97df1e1311e9" xlink:to="loc_us-gaap_RestrictedStockMember_ed389d51-d874-4628-83af-7392304bc631" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/StockBasedCompensationSummaryofTotalUnrecognizedCompensationCostRelatedtoStockBasedCompensationDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#StockBasedCompensationSummaryofTotalUnrecognizedCompensationCostRelatedtoStockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/StockBasedCompensationSummaryofTotalUnrecognizedCompensationCostRelatedtoStockBasedCompensationDetails" xlink:type="extended" id="id11112527f9248a1bc47606ed04113bc_StockBasedCompensationSummaryofTotalUnrecognizedCompensationCostRelatedtoStockBasedCompensationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a2d2ec6f-f9e3-4f01-9c7c-0089910b685c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_dd86d5c4-65e4-4485-9a43-7363294eaf82" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a2d2ec6f-f9e3-4f01-9c7c-0089910b685c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_dd86d5c4-65e4-4485-9a43-7363294eaf82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_43c285e0-fb9c-40bf-bd2c-188c26ed8b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a2d2ec6f-f9e3-4f01-9c7c-0089910b685c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_43c285e0-fb9c-40bf-bd2c-188c26ed8b6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_81f12581-c352-42fe-af14-84525cab1bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a2d2ec6f-f9e3-4f01-9c7c-0089910b685c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_81f12581-c352-42fe-af14-84525cab1bd6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b2c6a2a8-8acd-476c-bbfd-1039c03703f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_81f12581-c352-42fe-af14-84525cab1bd6" xlink:to="loc_us-gaap_AwardTypeAxis_b2c6a2a8-8acd-476c-bbfd-1039c03703f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b2c6a2a8-8acd-476c-bbfd-1039c03703f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b2c6a2a8-8acd-476c-bbfd-1039c03703f3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b2c6a2a8-8acd-476c-bbfd-1039c03703f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f02d5c73-9b3b-4c00-90a8-2204057a80ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b2c6a2a8-8acd-476c-bbfd-1039c03703f3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f02d5c73-9b3b-4c00-90a8-2204057a80ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_eb46e5be-10c5-430f-af3a-9cb27d04d73a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f02d5c73-9b3b-4c00-90a8-2204057a80ad" xlink:to="loc_us-gaap_EmployeeStockOptionMember_eb46e5be-10c5-430f-af3a-9cb27d04d73a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_f8376b0b-c8d6-43ae-9582-8dc925d8e507" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f02d5c73-9b3b-4c00-90a8-2204057a80ad" xlink:to="loc_us-gaap_RestrictedStockMember_f8376b0b-c8d6-43ae-9582-8dc925d8e507" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/AcquisitionsNarrativeDetails" xlink:type="extended" id="if35f74a2f98a44e1b5463f00c30de063_AcquisitionsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_870a3f2a-6464-46dc-9a88-81faf7fc5878" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_870a3f2a-6464-46dc-9a88-81faf7fc5878" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_PaymentsForInvestmentInBusiness_e26ec66a-0523-47de-a3de-213e69a35f2c" xlink:href="flt-20220930.xsd#flt_PaymentsForInvestmentInBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_flt_PaymentsForInvestmentInBusiness_e26ec66a-0523-47de-a3de-213e69a35f2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_30d55745-a69a-47e6-867e-2bd92e65bfb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_30d55745-a69a-47e6-867e-2bd92e65bfb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized_5cc57633-e488-4f7d-ba70-1fef991d220a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized_5cc57633-e488-4f7d-ba70-1fef991d220a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_867ba60d-a36b-4961-af4b-9f595564d053" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_867ba60d-a36b-4961-af4b-9f595564d053" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_RestrictedCashAcquiredFromAcquisition_853a2af5-7d75-4ec7-9286-f546f19ec5aa" xlink:href="flt-20220930.xsd#flt_RestrictedCashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_flt_RestrictedCashAcquiredFromAcquisition_853a2af5-7d75-4ec7-9286-f546f19ec5aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInterestInJointVenture_1966a6d1-561b-4b8e-970d-d69ee64817b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireInterestInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_us-gaap_PaymentsToAcquireInterestInJointVenture_1966a6d1-561b-4b8e-970d-d69ee64817b9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_8bdc1b68-28ff-450d-a1ee-cd6011d4de03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_8bdc1b68-28ff-450d-a1ee-cd6011d4de03" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_72496f5c-a1f2-4afc-92dc-eb7a33127e26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0b69e245-34ea-4dad-a21d-34d37c1ab126" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_72496f5c-a1f2-4afc-92dc-eb7a33127e26" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9ff87361-d41f-4fc0-a789-db5e805e9c3c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_72496f5c-a1f2-4afc-92dc-eb7a33127e26" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9ff87361-d41f-4fc0-a789-db5e805e9c3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9ff87361-d41f-4fc0-a789-db5e805e9c3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9ff87361-d41f-4fc0-a789-db5e805e9c3c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9ff87361-d41f-4fc0-a789-db5e805e9c3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9ff87361-d41f-4fc0-a789-db5e805e9c3c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_RoomexMember_189b4e03-b390-4d47-860e-26b54e38e7be" xlink:href="flt-20220930.xsd#flt_RoomexMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_RoomexMember_189b4e03-b390-4d47-860e-26b54e38e7be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_LevartiAccrualifyAndPlugsurfingMember_bc1423b5-c471-4592-902c-f12684ce63ea" xlink:href="flt-20220930.xsd#flt_LevartiAccrualifyAndPlugsurfingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_LevartiAccrualifyAndPlugsurfingMember_bc1423b5-c471-4592-902c-f12684ce63ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_OtherElectricVehicleChargingPaymentsBusinessMember_c853873b-ec4f-40fc-99bb-e5cce7aaeda1" xlink:href="flt-20220930.xsd#flt_OtherElectricVehicleChargingPaymentsBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_OtherElectricVehicleChargingPaymentsBusinessMember_c853873b-ec4f-40fc-99bb-e5cce7aaeda1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_OtherElectricVehicleDataAnalyticsBusinessMember_a9c6cec9-37e5-47f2-92f5-85d36c476773" xlink:href="flt-20220930.xsd#flt_OtherElectricVehicleDataAnalyticsBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_OtherElectricVehicleDataAnalyticsBusinessMember_a9c6cec9-37e5-47f2-92f5-85d36c476773" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ALESolutionsIncMember_1cdcf754-351b-4701-a01c-a7fb67f2dba9" xlink:href="flt-20220930.xsd#flt_ALESolutionsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_ALESolutionsIncMember_1cdcf754-351b-4701-a01c-a7fb67f2dba9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_AssociatedForeignExchangeMember_7a42ea6a-b207-458d-9dbb-a10715e32ec3" xlink:href="flt-20220930.xsd#flt_AssociatedForeignExchangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_AssociatedForeignExchangeMember_7a42ea6a-b207-458d-9dbb-a10715e32ec3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_RogerMember_1bc36eea-b192-4711-8ad0-b7993ce20ad2" xlink:href="flt-20220930.xsd#flt_RogerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_RogerMember_1bc36eea-b192-4711-8ad0-b7993ce20ad2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_OtherAcquisitionsMember_ec0aa85a-b20e-4e66-baf5-ef282f34a216" xlink:href="flt-20220930.xsd#flt_OtherAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_OtherAcquisitionsMember_ec0aa85a-b20e-4e66-baf5-ef282f34a216" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_OtherElectricVehicleSearchAndPayMappingServiceMember_53750198-f0d2-4213-81a2-6788f242fbfc" xlink:href="flt-20220930.xsd#flt_OtherElectricVehicleSearchAndPayMappingServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2e970b3b-1458-422d-8408-e4f7e3f653e4" xlink:to="loc_flt_OtherElectricVehicleSearchAndPayMappingServiceMember_53750198-f0d2-4213-81a2-6788f242fbfc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_a2f4fb67-c7bf-4b38-b617-306a85cf34a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_72496f5c-a1f2-4afc-92dc-eb7a33127e26" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_a2f4fb67-c7bf-4b38-b617-306a85cf34a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a2f4fb67-c7bf-4b38-b617-306a85cf34a9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a2f4fb67-c7bf-4b38-b617-306a85cf34a9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a2f4fb67-c7bf-4b38-b617-306a85cf34a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_2f0f6fa2-9ecc-4836-8db4-bf9b14872df0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a2f4fb67-c7bf-4b38-b617-306a85cf34a9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_2f0f6fa2-9ecc-4836-8db4-bf9b14872df0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_0f741d28-03a2-465f-b359-27f4bc01621d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_2f0f6fa2-9ecc-4836-8db4-bf9b14872df0" xlink:to="loc_us-gaap_SubsequentEventMember_0f741d28-03a2-465f-b359-27f4bc01621d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/AcquisitionsSummaryofPurchasePriceAllocationDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#AcquisitionsSummaryofPurchasePriceAllocationDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/AcquisitionsSummaryofPurchasePriceAllocationDetails" xlink:type="extended" id="i39d510128b6743eea8085086917fac9b_AcquisitionsSummaryofPurchasePriceAllocationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_d7955dfb-4372-4ff2-b2f1-b9dc3b967064" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_d7955dfb-4372-4ff2-b2f1-b9dc3b967064" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_7abb2dc5-c7e9-48c7-a2f1-4c6ebc13ef72" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_7abb2dc5-c7e9-48c7-a2f1-4c6ebc13ef72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_e1be481a-3ceb-4f8f-b3be-05979029ed99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_e1be481a-3ceb-4f8f-b3be-05979029ed99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_7032f816-f207-4d1c-ade4-fb81aeb2570b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_7032f816-f207-4d1c-ade4-fb81aeb2570b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_11040f2d-1d7b-409c-b6b3-df3849298e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_Goodwill_11040f2d-1d7b-409c-b6b3-df3849298e6c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_9ffc6f1f-9c1d-4bc8-8050-66dc5fda8062" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_9ffc6f1f-9c1d-4bc8-8050-66dc5fda8062" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndAccruedExpenses_517ef8d9-2f9e-4e90-9c44-cb1ca08a1e6b" xlink:href="flt-20220930.xsd#flt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndAccruedExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_flt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndAccruedExpenses_517ef8d9-2f9e-4e90-9c44-cb1ca08a1e6b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_3008594d-cbd7-46c1-8274-b1fccd132405" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_3008594d-cbd7-46c1-8274-b1fccd132405" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_3fd556aa-1eb3-40e6-9c91-3cedd51f0125" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_3fd556aa-1eb3-40e6-9c91-3cedd51f0125" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_2fc4fcfc-e340-42ec-8c25-bafe483a411e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_2fc4fcfc-e340-42ec-8c25-bafe483a411e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesCustomerDeposits_a02364f5-9722-426e-8acf-2ed73bfac1c5" xlink:href="flt-20220930.xsd#flt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesCustomerDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_flt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesCustomerDeposits_a02364f5-9722-426e-8acf-2ed73bfac1c5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_32dde0d9-ecf7-4b37-8292-25696a959626" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_32dde0d9-ecf7-4b37-8292-25696a959626" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_4722920a-17d8-4de8-9ee8-e2debc4253b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_4722920a-17d8-4de8-9ee8-e2debc4253b4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c357c245-965b-473f-bc93-7c67e715b265" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2018bea1-1158-4073-9a81-23c7bda892c3" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c357c245-965b-473f-bc93-7c67e715b265" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7d90c502-8e56-4184-91a9-7194b88a111a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c357c245-965b-473f-bc93-7c67e715b265" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7d90c502-8e56-4184-91a9-7194b88a111a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d90c502-8e56-4184-91a9-7194b88a111a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7d90c502-8e56-4184-91a9-7194b88a111a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d90c502-8e56-4184-91a9-7194b88a111a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_565e92d5-65e6-4504-a513-70be7e497c36" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7d90c502-8e56-4184-91a9-7194b88a111a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_565e92d5-65e6-4504-a513-70be7e497c36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ALESolutionsIncMember_8293fa49-62bb-4d49-9592-8630e76640d8" xlink:href="flt-20220930.xsd#flt_ALESolutionsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_565e92d5-65e6-4504-a513-70be7e497c36" xlink:to="loc_flt_ALESolutionsIncMember_8293fa49-62bb-4d49-9592-8630e76640d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_AssociatedForeignExchangeMember_e6deaa22-ed38-4716-aecf-1b82cdbe9a02" xlink:href="flt-20220930.xsd#flt_AssociatedForeignExchangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_565e92d5-65e6-4504-a513-70be7e497c36" xlink:to="loc_flt_AssociatedForeignExchangeMember_e6deaa22-ed38-4716-aecf-1b82cdbe9a02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_RogerMember_c0a10bba-8d2a-4dc9-b243-889d726c9a17" xlink:href="flt-20220930.xsd#flt_RogerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_565e92d5-65e6-4504-a513-70be7e497c36" xlink:to="loc_flt_RogerMember_c0a10bba-8d2a-4dc9-b243-889d726c9a17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_LevartiAccrualifyAndPlugsurfingMember_bfaedbe4-a19c-471a-b12d-c9dcf666202b" xlink:href="flt-20220930.xsd#flt_LevartiAccrualifyAndPlugsurfingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_565e92d5-65e6-4504-a513-70be7e497c36" xlink:to="loc_flt_LevartiAccrualifyAndPlugsurfingMember_bfaedbe4-a19c-471a-b12d-c9dcf666202b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/AcquisitionsSummaryofPreliminaryEstimatedFairValueofIntangibleAssetsAcquiredandtheRelatedEstimatedUsefulLivesDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#AcquisitionsSummaryofPreliminaryEstimatedFairValueofIntangibleAssetsAcquiredandtheRelatedEstimatedUsefulLivesDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/AcquisitionsSummaryofPreliminaryEstimatedFairValueofIntangibleAssetsAcquiredandtheRelatedEstimatedUsefulLivesDetails" xlink:type="extended" id="i9425fd9355984c4a8e936708e06ffd10_AcquisitionsSummaryofPreliminaryEstimatedFairValueofIntangibleAssetsAcquiredandtheRelatedEstimatedUsefulLivesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_d8a2417c-7027-4a9a-9c4c-eda947f2a1e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_9e766a9f-c286-4dae-bc86-f592c1a20c2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d8a2417c-7027-4a9a-9c4c-eda947f2a1e6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_9e766a9f-c286-4dae-bc86-f592c1a20c2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_14f10e60-c941-4e86-b6c0-1e819b1c4577" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d8a2417c-7027-4a9a-9c4c-eda947f2a1e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_14f10e60-c941-4e86-b6c0-1e819b1c4577" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_47139667-06f0-4b77-a068-31cb99d123c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d8a2417c-7027-4a9a-9c4c-eda947f2a1e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_47139667-06f0-4b77-a068-31cb99d123c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49f4aab4-3f48-4b14-a0a3-f9412cfce4c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d8a2417c-7027-4a9a-9c4c-eda947f2a1e6" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49f4aab4-3f48-4b14-a0a3-f9412cfce4c8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_48c1122f-cfe7-4077-a2b1-d5f1e07763b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49f4aab4-3f48-4b14-a0a3-f9412cfce4c8" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_48c1122f-cfe7-4077-a2b1-d5f1e07763b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_48c1122f-cfe7-4077-a2b1-d5f1e07763b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_48c1122f-cfe7-4077-a2b1-d5f1e07763b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_48c1122f-cfe7-4077-a2b1-d5f1e07763b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be747e0e-c4b2-41fb-ae02-fedb6501e888" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_48c1122f-cfe7-4077-a2b1-d5f1e07763b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be747e0e-c4b2-41fb-ae02-fedb6501e888" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ALESolutionsIncMember_c668f17a-36c5-4735-88e9-07665931c3e5" xlink:href="flt-20220930.xsd#flt_ALESolutionsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be747e0e-c4b2-41fb-ae02-fedb6501e888" xlink:to="loc_flt_ALESolutionsIncMember_c668f17a-36c5-4735-88e9-07665931c3e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_AssociatedForeignExchangeMember_8f158608-e6a2-42d9-b42f-742c078bd20b" xlink:href="flt-20220930.xsd#flt_AssociatedForeignExchangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be747e0e-c4b2-41fb-ae02-fedb6501e888" xlink:to="loc_flt_AssociatedForeignExchangeMember_8f158608-e6a2-42d9-b42f-742c078bd20b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_RogerMember_67105fd5-d64b-4f10-ad23-eef1b893b284" xlink:href="flt-20220930.xsd#flt_RogerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be747e0e-c4b2-41fb-ae02-fedb6501e888" xlink:to="loc_flt_RogerMember_67105fd5-d64b-4f10-ad23-eef1b893b284" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_80c65e76-1acd-43bf-ba1f-97ad469b533d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49f4aab4-3f48-4b14-a0a3-f9412cfce4c8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_80c65e76-1acd-43bf-ba1f-97ad469b533d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_80c65e76-1acd-43bf-ba1f-97ad469b533d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_80c65e76-1acd-43bf-ba1f-97ad469b533d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_80c65e76-1acd-43bf-ba1f-97ad469b533d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_80c65e76-1acd-43bf-ba1f-97ad469b533d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_9333b71e-f2bf-41e9-a7c5-7591d6af1053" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_9333b71e-f2bf-41e9-a7c5-7591d6af1053" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_a111dacf-ac71-4fdc-a2e9-578ff76b461d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_a111dacf-ac71-4fdc-a2e9-578ff76b461d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_LodgingMember_b2114dd2-845f-4f12-9fd3-b6907fba47e5" xlink:href="flt-20220930.xsd#flt_LodgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:to="loc_flt_LodgingMember_b2114dd2-845f-4f12-9fd3-b6907fba47e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_BankingRelationshipsMember_dfea647b-b513-4e79-9693-a95f68769fb5" xlink:href="flt-20220930.xsd#flt_BankingRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:to="loc_flt_BankingRelationshipsMember_dfea647b-b513-4e79-9693-a95f68769fb5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseMember_d20aa79a-99f5-4520-80a6-be957abedf8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:to="loc_us-gaap_LicenseMember_d20aa79a-99f5-4520-80a6-be957abedf8f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_44f99519-531a-4107-a951-c21562b90177" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b09c5706-6cec-4507-98e5-fc162d6db05b" xlink:to="loc_us-gaap_CustomerRelationshipsMember_44f99519-531a-4107-a951-c21562b90177" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b878bb1c-4321-47e0-8a49-f63e9f3bd367" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_49f4aab4-3f48-4b14-a0a3-f9412cfce4c8" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b878bb1c-4321-47e0-8a49-f63e9f3bd367" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_b878bb1c-4321-47e0-8a49-f63e9f3bd367_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b878bb1c-4321-47e0-8a49-f63e9f3bd367" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_b878bb1c-4321-47e0-8a49-f63e9f3bd367_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_5c398cb9-74e6-4ada-9f0f-796bde4306a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b878bb1c-4321-47e0-8a49-f63e9f3bd367" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_5c398cb9-74e6-4ada-9f0f-796bde4306a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_6a99bab0-9c5e-4db6-bdbc-af2404163e49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_5c398cb9-74e6-4ada-9f0f-796bde4306a9" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_6a99bab0-9c5e-4db6-bdbc-af2404163e49" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/GoodwillandOtherIntangiblesScheduleofOtherIntangiblesDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#GoodwillandOtherIntangiblesScheduleofOtherIntangiblesDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/GoodwillandOtherIntangiblesScheduleofOtherIntangiblesDetails" xlink:type="extended" id="ie3a5544f55614a0ba6a344ce8a3e616f_GoodwillandOtherIntangiblesScheduleofOtherIntangiblesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsLineItems_8a4d99cf-d178-404a-91e1-373c5c53b9eb" xlink:href="flt-20220930.xsd#flt_FiniteAndIndefiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_eae754bb-ea89-4563-8456-bb839c73a675" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsLineItems_8a4d99cf-d178-404a-91e1-373c5c53b9eb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_eae754bb-ea89-4563-8456-bb839c73a675" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_24e0a70b-06a1-48ba-8903-71cc6da65568" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsLineItems_8a4d99cf-d178-404a-91e1-373c5c53b9eb" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_24e0a70b-06a1-48ba-8903-71cc6da65568" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b73c00d6-324a-4801-81fc-75b61557d177" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsLineItems_8a4d99cf-d178-404a-91e1-373c5c53b9eb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b73c00d6-324a-4801-81fc-75b61557d177" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ccb17548-9a42-486c-9d4f-2adcdf30d663" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsLineItems_8a4d99cf-d178-404a-91e1-373c5c53b9eb" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ccb17548-9a42-486c-9d4f-2adcdf30d663" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsTable_faba241f-463b-4dfa-9416-e943ce375fa7" xlink:href="flt-20220930.xsd#flt_FiniteAndIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsLineItems_8a4d99cf-d178-404a-91e1-373c5c53b9eb" xlink:to="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsTable_faba241f-463b-4dfa-9416-e943ce375fa7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_15b066b8-a3c3-45ca-af12-7a848a270596" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsTable_faba241f-463b-4dfa-9416-e943ce375fa7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_15b066b8-a3c3-45ca-af12-7a848a270596" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_15b066b8-a3c3-45ca-af12-7a848a270596_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_15b066b8-a3c3-45ca-af12-7a848a270596" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_15b066b8-a3c3-45ca-af12-7a848a270596_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0401c8a7-5018-42c6-a9d4-06dfc3cd7587" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_15b066b8-a3c3-45ca-af12-7a848a270596" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0401c8a7-5018-42c6-a9d4-06dfc3cd7587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_CustomerAndVendorContractsMember_192500bc-6299-4daa-8a92-0829c7e129e5" xlink:href="flt-20220930.xsd#flt_CustomerAndVendorContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0401c8a7-5018-42c6-a9d4-06dfc3cd7587" xlink:to="loc_flt_CustomerAndVendorContractsMember_192500bc-6299-4daa-8a92-0829c7e129e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_8f5e9bb9-2945-4fd9-a289-7291cdd49aad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0401c8a7-5018-42c6-a9d4-06dfc3cd7587" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_8f5e9bb9-2945-4fd9-a289-7291cdd49aad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_608557e3-58b9-446b-8e11-620a2c7f53fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0401c8a7-5018-42c6-a9d4-06dfc3cd7587" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_608557e3-58b9-446b-8e11-620a2c7f53fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_5bc0922a-3555-44c7-8573-ea5318f5307a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0401c8a7-5018-42c6-a9d4-06dfc3cd7587" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_5bc0922a-3555-44c7-8573-ea5318f5307a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b2a22b2b-5133-47fa-8ded-8cab63196dba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_flt_FiniteAndIndefiniteLivedIntangibleAssetsTable_faba241f-463b-4dfa-9416-e943ce375fa7" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b2a22b2b-5133-47fa-8ded-8cab63196dba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_b2a22b2b-5133-47fa-8ded-8cab63196dba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b2a22b2b-5133-47fa-8ded-8cab63196dba" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_b2a22b2b-5133-47fa-8ded-8cab63196dba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_d76d57c8-74ca-4ad4-92a0-0ed783d95577" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_b2a22b2b-5133-47fa-8ded-8cab63196dba" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_d76d57c8-74ca-4ad4-92a0-0ed783d95577" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_TradeNamesAndTrademarksIndefiniteLivedMember_bdb0693b-803e-4151-a505-b0c625ba79c0" xlink:href="flt-20220930.xsd#flt_TradeNamesAndTrademarksIndefiniteLivedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_d76d57c8-74ca-4ad4-92a0-0ed783d95577" xlink:to="loc_flt_TradeNamesAndTrademarksIndefiniteLivedMember_bdb0693b-803e-4151-a505-b0c625ba79c0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DebtSummaryofDebtInstrumentsDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DebtSummaryofDebtInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DebtSummaryofDebtInstrumentsDetails" xlink:type="extended" id="i27a520e33b2046c3aedec8b0bd39d84d_DebtSummaryofDebtInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayable_be6da65a-6551-4de9-9e3f-c88e551e3d44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_NotesPayable_be6da65a-6551-4de9-9e3f-c88e551e3d44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_9e1a0b68-a1ac-4b0f-8159-f4ff1c74d9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_LineOfCredit_9e1a0b68-a1ac-4b0f-8159-f4ff1c74d9f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesAndLoansPayable_aee3d332-90cf-4154-9687-cef1b8b2e1e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesAndLoansPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_NotesAndLoansPayable_aee3d332-90cf-4154-9687-cef1b8b2e1e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtCurrent_f0b610d0-3d74-4653-9855-22db6d144e41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_SecuredDebtCurrent_f0b610d0-3d74-4653-9855-22db6d144e41" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_e6465323-0e1e-441a-a1cf-dfa6d7ffaf66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_e6465323-0e1e-441a-a1cf-dfa6d7ffaf66" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_b8bea178-cb05-4565-a690-e78f08dbfb78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_LongTermDebtCurrent_b8bea178-cb05-4565-a690-e78f08dbfb78" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermNotesAndLoans_642540e6-b629-471a-a6d4-815e2ff85e89" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermNotesAndLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_LongTermNotesAndLoans_642540e6-b629-471a-a6d4-815e2ff85e89" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_881dd491-2711-40b7-87ae-e91ce7b38adc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a84254c2-acb1-4c16-8497-008490d77188" xlink:to="loc_us-gaap_DebtInstrumentTable_881dd491-2711-40b7-87ae-e91ce7b38adc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_db8a3c95-4e0a-44f8-ad33-de77897633d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_881dd491-2711-40b7-87ae-e91ce7b38adc" xlink:to="loc_us-gaap_CreditFacilityAxis_db8a3c95-4e0a-44f8-ad33-de77897633d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_db8a3c95-4e0a-44f8-ad33-de77897633d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_db8a3c95-4e0a-44f8-ad33-de77897633d1" xlink:to="loc_us-gaap_CreditFacilityDomain_db8a3c95-4e0a-44f8-ad33-de77897633d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_67f413d3-6326-41b2-98ab-612fb416d9c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_db8a3c95-4e0a-44f8-ad33-de77897633d1" xlink:to="loc_us-gaap_CreditFacilityDomain_67f413d3-6326-41b2-98ab-612fb416d9c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_TermLoanAMember_1a861e46-b38f-418c-8745-b9b82d272413" xlink:href="flt-20220930.xsd#flt_TermLoanAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_67f413d3-6326-41b2-98ab-612fb416d9c2" xlink:to="loc_flt_TermLoanAMember_1a861e46-b38f-418c-8745-b9b82d272413" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_TermLoanBMember_debd57a5-399a-43a3-9368-795b965cda1a" xlink:href="flt-20220930.xsd#flt_TermLoanBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_67f413d3-6326-41b2-98ab-612fb416d9c2" xlink:to="loc_flt_TermLoanBMember_debd57a5-399a-43a3-9368-795b965cda1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_2acf77b0-c5a1-4a61-a4a9-d1e5dacef059" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_67f413d3-6326-41b2-98ab-612fb416d9c2" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_2acf77b0-c5a1-4a61-a4a9-d1e5dacef059" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DebtNarrativeDetails" xlink:type="extended" id="i33b13136110242dfbc4047b27d1a271f_DebtNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_9eb3597a-aaea-4833-b560-3ff5c6f46e93" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_9eb3597a-aaea-4833-b560-3ff5c6f46e93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_ed6bdf0a-11bb-41d0-856e-f13c0fa36f0a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:to="loc_us-gaap_LineOfCredit_ed6bdf0a-11bb-41d0-856e-f13c0fa36f0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacity_f884d3d4-0e1e-48c6-bd39-52e31ad181b5" xlink:href="flt-20220930.xsd#flt_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:to="loc_flt_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacity_f884d3d4-0e1e-48c6-bd39-52e31ad181b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_56dcd08d-4554-4e3b-883d-da8b47f1ae97" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_56dcd08d-4554-4e3b-883d-da8b47f1ae97" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_19dcd271-1f72-4913-9ace-81a5572a7c2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_19dcd271-1f72-4913-9ace-81a5572a7c2d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_9e7ca341-3ed6-44d8-822e-67a55eb0743e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_9e7ca341-3ed6-44d8-822e-67a55eb0743e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c0afa836-ae6c-422e-8432-31741bd539c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd62917d-42bb-4725-bf1a-2f1570d01367" xlink:to="loc_us-gaap_DebtInstrumentTable_c0afa836-ae6c-422e-8432-31741bd539c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_e2c08d46-a30f-4fa2-a0ab-6a72120f0b93" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c0afa836-ae6c-422e-8432-31741bd539c6" xlink:to="loc_us-gaap_VariableRateAxis_e2c08d46-a30f-4fa2-a0ab-6a72120f0b93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_e2c08d46-a30f-4fa2-a0ab-6a72120f0b93_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_e2c08d46-a30f-4fa2-a0ab-6a72120f0b93" xlink:to="loc_us-gaap_VariableRateDomain_e2c08d46-a30f-4fa2-a0ab-6a72120f0b93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_17d09bc3-5c13-4a25-b0ac-ef979493e207" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_e2c08d46-a30f-4fa2-a0ab-6a72120f0b93" xlink:to="loc_us-gaap_VariableRateDomain_17d09bc3-5c13-4a25-b0ac-ef979493e207" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_0ea59060-f34d-4a70-9eec-3f89bd38b9aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_17d09bc3-5c13-4a25-b0ac-ef979493e207" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_0ea59060-f34d-4a70-9eec-3f89bd38b9aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b50c4b43-0e61-481d-80bf-82f48cc18e1f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c0afa836-ae6c-422e-8432-31741bd539c6" xlink:to="loc_us-gaap_DebtInstrumentAxis_b50c4b43-0e61-481d-80bf-82f48cc18e1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b50c4b43-0e61-481d-80bf-82f48cc18e1f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b50c4b43-0e61-481d-80bf-82f48cc18e1f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b50c4b43-0e61-481d-80bf-82f48cc18e1f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_111bfc2d-729f-4895-a869-d2536540a9cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b50c4b43-0e61-481d-80bf-82f48cc18e1f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_111bfc2d-729f-4895-a869-d2536540a9cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_ReceivablesSecuritizationFacilityMember_9fc17657-9edf-45f1-b57b-bd33b1911b99" xlink:href="flt-20220930.xsd#flt_ReceivablesSecuritizationFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_111bfc2d-729f-4895-a869-d2536540a9cb" xlink:to="loc_flt_ReceivablesSecuritizationFacilityMember_9fc17657-9edf-45f1-b57b-bd33b1911b99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_CreditAgreementMember_271b4d84-3516-492a-a805-8122054c7d21" xlink:href="flt-20220930.xsd#flt_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_111bfc2d-729f-4895-a869-d2536540a9cb" xlink:to="loc_flt_CreditAgreementMember_271b4d84-3516-492a-a805-8122054c7d21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_991db39f-db49-4100-882c-1f44f064ca1c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c0afa836-ae6c-422e-8432-31741bd539c6" xlink:to="loc_us-gaap_CreditFacilityAxis_991db39f-db49-4100-882c-1f44f064ca1c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_991db39f-db49-4100-882c-1f44f064ca1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_991db39f-db49-4100-882c-1f44f064ca1c" xlink:to="loc_us-gaap_CreditFacilityDomain_991db39f-db49-4100-882c-1f44f064ca1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_514c2d04-b5c0-4d3a-883f-ea45c2ae6038" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_991db39f-db49-4100-882c-1f44f064ca1c" xlink:to="loc_us-gaap_CreditFacilityDomain_514c2d04-b5c0-4d3a-883f-ea45c2ae6038" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_TermLoanAMember_ade9e72c-a717-4828-aa9f-3e8a9fc31694" xlink:href="flt-20220930.xsd#flt_TermLoanAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_514c2d04-b5c0-4d3a-883f-ea45c2ae6038" xlink:to="loc_flt_TermLoanAMember_ade9e72c-a717-4828-aa9f-3e8a9fc31694" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_ba8bb7dc-fc69-4965-b5dc-9593499ce2cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_514c2d04-b5c0-4d3a-883f-ea45c2ae6038" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_ba8bb7dc-fc69-4965-b5dc-9593499ce2cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cd61b52f-4e22-4d65-92d1-e568232c5e58" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c0afa836-ae6c-422e-8432-31741bd539c6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cd61b52f-4e22-4d65-92d1-e568232c5e58" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cd61b52f-4e22-4d65-92d1-e568232c5e58_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cd61b52f-4e22-4d65-92d1-e568232c5e58" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cd61b52f-4e22-4d65-92d1-e568232c5e58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_49aa14e4-8358-4a4c-ac87-82ab688a2074" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cd61b52f-4e22-4d65-92d1-e568232c5e58" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_49aa14e4-8358-4a4c-ac87-82ab688a2074" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_983bfb55-377f-411c-91e1-03d30bae610f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_49aa14e4-8358-4a4c-ac87-82ab688a2074" xlink:to="loc_us-gaap_LineOfCreditMember_983bfb55-377f-411c-91e1-03d30bae610f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/EarningsPerShareNarrativeDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#EarningsPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended" id="i7b992dbc13664d68be07fa74ca84d41d_EarningsPerShareNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_524bf187-196c-4c8c-8049-0f10d63bec10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e51d3b87-b2b4-4a70-b50d-3b22b66e9d18" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_524bf187-196c-4c8c-8049-0f10d63bec10" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e51d3b87-b2b4-4a70-b50d-3b22b66e9d18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_4d086caf-04e3-4fc9-9494-a361a7d763c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_524bf187-196c-4c8c-8049-0f10d63bec10" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_4d086caf-04e3-4fc9-9494-a361a7d763c8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_46ab81a1-d1b1-442a-a7c6-b69d3b6ea9e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_4d086caf-04e3-4fc9-9494-a361a7d763c8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_46ab81a1-d1b1-442a-a7c6-b69d3b6ea9e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_46ab81a1-d1b1-442a-a7c6-b69d3b6ea9e3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_46ab81a1-d1b1-442a-a7c6-b69d3b6ea9e3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_46ab81a1-d1b1-442a-a7c6-b69d3b6ea9e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_c7384dc2-72b7-40ab-98fb-71ea2f0810ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_46ab81a1-d1b1-442a-a7c6-b69d3b6ea9e3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_c7384dc2-72b7-40ab-98fb-71ea2f0810ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_58ce8b4b-aadc-4398-bcfa-69f81e77ab15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_c7384dc2-72b7-40ab-98fb-71ea2f0810ce" xlink:to="loc_us-gaap_EmployeeStockOptionMember_58ce8b4b-aadc-4398-bcfa-69f81e77ab15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_dbce0724-3931-4e1f-8f6d-daaf3180faf4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_c7384dc2-72b7-40ab-98fb-71ea2f0810ce" xlink:to="loc_us-gaap_PerformanceSharesMember_dbce0724-3931-4e1f-8f6d-daaf3180faf4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/SegmentsScheduleofCompanysSegmentResultsDetail" xlink:type="simple" xlink:href="flt-20220930.xsd#SegmentsScheduleofCompanysSegmentResultsDetail"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/SegmentsScheduleofCompanysSegmentResultsDetail" xlink:type="extended" id="ia0e24e469da6437c889cd993808ca55c_SegmentsScheduleofCompanysSegmentResultsDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_5febe96f-94ee-4946-acc4-ebda99497076" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_ef902960-2bdf-481b-925c-4bac3b514fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5febe96f-94ee-4946-acc4-ebda99497076" xlink:to="loc_us-gaap_Revenues_ef902960-2bdf-481b-925c-4bac3b514fcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_487bcfe2-80b7-4b3f-9ec6-438fac1be0e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5febe96f-94ee-4946-acc4-ebda99497076" xlink:to="loc_us-gaap_OperatingIncomeLoss_487bcfe2-80b7-4b3f-9ec6-438fac1be0e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_9e401780-c772-45e4-a488-19ffd6882aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5febe96f-94ee-4946-acc4-ebda99497076" xlink:to="loc_us-gaap_DepreciationAndAmortization_9e401780-c772-45e4-a488-19ffd6882aa0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_3c28736a-26c7-476c-84d0-cf0ac077c42b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5febe96f-94ee-4946-acc4-ebda99497076" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_3c28736a-26c7-476c-84d0-cf0ac077c42b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_f3ead5cc-7977-419b-9ce6-1081d9c3ee08" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_3c28736a-26c7-476c-84d0-cf0ac077c42b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_f3ead5cc-7977-419b-9ce6-1081d9c3ee08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f3ead5cc-7977-419b-9ce6-1081d9c3ee08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f3ead5cc-7977-419b-9ce6-1081d9c3ee08" xlink:to="loc_us-gaap_SegmentDomain_f3ead5cc-7977-419b-9ce6-1081d9c3ee08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3c1d2da6-0a18-487d-b609-4d6a094c0667" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f3ead5cc-7977-419b-9ce6-1081d9c3ee08" xlink:to="loc_us-gaap_SegmentDomain_3c1d2da6-0a18-487d-b609-4d6a094c0667" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_FleetMember_86e8cc66-fe75-418b-b592-586f66ed5534" xlink:href="flt-20220930.xsd#flt_FleetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c1d2da6-0a18-487d-b609-4d6a094c0667" xlink:to="loc_flt_FleetMember_86e8cc66-fe75-418b-b592-586f66ed5534" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_PaymentsMember_3deb611d-fa2c-4b29-bc6d-640dee6cf6d6" xlink:href="flt-20220930.xsd#flt_PaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c1d2da6-0a18-487d-b609-4d6a094c0667" xlink:to="loc_flt_PaymentsMember_3deb611d-fa2c-4b29-bc6d-640dee6cf6d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_LodgingMember_eca86dca-b55a-4023-a19f-8162796b0115" xlink:href="flt-20220930.xsd#flt_LodgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c1d2da6-0a18-487d-b609-4d6a094c0667" xlink:to="loc_flt_LodgingMember_eca86dca-b55a-4023-a19f-8162796b0115" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_BrazilSegmentMember_22c34eca-e4f1-4f69-8684-d0a599309290" xlink:href="flt-20220930.xsd#flt_BrazilSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c1d2da6-0a18-487d-b609-4d6a094c0667" xlink:to="loc_flt_BrazilSegmentMember_22c34eca-e4f1-4f69-8684-d0a599309290" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_OtherMember_4f7d3380-b446-4de4-9bf6-838014bd4fcb" xlink:href="flt-20220930.xsd#flt_OtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c1d2da6-0a18-487d-b609-4d6a094c0667" xlink:to="loc_flt_OtherMember_4f7d3380-b446-4de4-9bf6-838014bd4fcb" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofNotionalAmountsDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofNotionalAmountsDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofNotionalAmountsDetails" xlink:type="extended" id="i27ae134c316a472b9a3e04a7f715d1ed_DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofNotionalAmountsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_9b9c6cce-a90d-499b-bf44-dfff09b5ccdc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_12fec8e5-bc7b-4165-88a2-b08460523882" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_9b9c6cce-a90d-499b-bf44-dfff09b5ccdc" xlink:to="loc_us-gaap_DerivativeNotionalAmount_12fec8e5-bc7b-4165-88a2-b08460523882" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_849fa529-5c55-4397-983d-2e18b69f3023" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_9b9c6cce-a90d-499b-bf44-dfff09b5ccdc" xlink:to="loc_us-gaap_DerivativeTable_849fa529-5c55-4397-983d-2e18b69f3023" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_b21e9a1b-c7ac-43d3-b645-4f7cdaf919a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_849fa529-5c55-4397-983d-2e18b69f3023" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_b21e9a1b-c7ac-43d3-b645-4f7cdaf919a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b21e9a1b-c7ac-43d3-b645-4f7cdaf919a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b21e9a1b-c7ac-43d3-b645-4f7cdaf919a4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b21e9a1b-c7ac-43d3-b645-4f7cdaf919a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_bda3b87b-efc1-4a95-8128-e308e2347032" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b21e9a1b-c7ac-43d3-b645-4f7cdaf919a4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_bda3b87b-efc1-4a95-8128-e308e2347032" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_4d384283-cfaf-4c7e-b250-e48bb37d0926" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bda3b87b-efc1-4a95-8128-e308e2347032" xlink:to="loc_us-gaap_CurrencySwapMember_4d384283-cfaf-4c7e-b250-e48bb37d0926" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_6c471d7b-f5d7-48f6-ad94-d978387bfb55" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bda3b87b-efc1-4a95-8128-e308e2347032" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_6c471d7b-f5d7-48f6-ad94-d978387bfb55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_WrittenForeignExchangeOptionMember_90a81d3d-f7e4-4935-807b-6406368294bc" xlink:href="flt-20220930.xsd#flt_WrittenForeignExchangeOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bda3b87b-efc1-4a95-8128-e308e2347032" xlink:to="loc_flt_WrittenForeignExchangeOptionMember_90a81d3d-f7e4-4935-807b-6406368294bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_PurchasedForeignExchangeOptionMember_bc414e82-c875-42c3-b691-67fc9e5bdd93" xlink:href="flt-20220930.xsd#flt_PurchasedForeignExchangeOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bda3b87b-efc1-4a95-8128-e308e2347032" xlink:to="loc_flt_PurchasedForeignExchangeOptionMember_bc414e82-c875-42c3-b691-67fc9e5bdd93" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValuebyBalanceSheetLocationDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValuebyBalanceSheetLocationDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValuebyBalanceSheetLocationDetails" xlink:type="extended" id="id192f171a8ac42a58b3306fff0b26e92_DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValuebyBalanceSheetLocationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_421660ea-ef0c-4c8e-b5a6-8b313b68be0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_421660ea-ef0c-4c8e-b5a6-8b313b68be0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_1ff65c50-a409-4609-881f-fbdc2611f80d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeCollateralObligationToReturnCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_1ff65c50-a409-4609-881f-fbdc2611f80d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_DerivativeAssetFairValueGrossAmountOffsetAgainstCollateral_a54aed59-b2a7-4b6e-8366-7483264c971a" xlink:href="flt-20220930.xsd#flt_DerivativeAssetFairValueGrossAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_flt_DerivativeAssetFairValueGrossAmountOffsetAgainstCollateral_a54aed59-b2a7-4b6e-8366-7483264c971a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_d6324e4e-a6df-4cfd-b545-c713dd9adde4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_d6324e4e-a6df-4cfd-b545-c713dd9adde4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_e3f2fc90-741e-4d5a-a0f6-b411ffaf7eba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeCollateralRightToReclaimCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_e3f2fc90-741e-4d5a-a0f6-b411ffaf7eba" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_DerivativeLiabilityFairValueGrossAmountOffsetAgainstCollateral_7e008f48-dc85-421a-b3f0-616d19fea9a9" xlink:href="flt-20220930.xsd#flt_DerivativeLiabilityFairValueGrossAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_flt_DerivativeLiabilityFairValueGrossAmountOffsetAgainstCollateral_7e008f48-dc85-421a-b3f0-616d19fea9a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_ccb03b3c-cb4e-4b0c-a02e-3c867a487f11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeAssets_ccb03b3c-cb4e-4b0c-a02e-3c867a487f11" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_90a5c55a-3eae-40be-bb43-0605567bcb45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_90a5c55a-3eae-40be-bb43-0605567bcb45" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_49fc25a9-5c12-4bfe-98ed-ef139ce364e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeLiabilities_49fc25a9-5c12-4bfe-98ed-ef139ce364e0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_9f3bf91b-809f-40e2-8931-2b3cb70a9c29" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_9f3bf91b-809f-40e2-8931-2b3cb70a9c29" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_de5c5a90-d9d6-46a2-a951-c1b8825c699d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_3f0e00b9-95f3-4143-bfc5-18b92dae5e3d" xlink:to="loc_us-gaap_DerivativeTable_de5c5a90-d9d6-46a2-a951-c1b8825c699d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_a1478d3a-4eb6-4be7-8204-9aeabad3c437" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_de5c5a90-d9d6-46a2-a951-c1b8825c699d" xlink:to="loc_us-gaap_HedgingDesignationAxis_a1478d3a-4eb6-4be7-8204-9aeabad3c437" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_a1478d3a-4eb6-4be7-8204-9aeabad3c437_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_a1478d3a-4eb6-4be7-8204-9aeabad3c437" xlink:to="loc_us-gaap_HedgingDesignationDomain_a1478d3a-4eb6-4be7-8204-9aeabad3c437_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_b1fd941c-c7e4-4696-9f64-b3761d930920" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_a1478d3a-4eb6-4be7-8204-9aeabad3c437" xlink:to="loc_us-gaap_HedgingDesignationDomain_b1fd941c-c7e4-4696-9f64-b3761d930920" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_19353610-8828-4bf1-96a9-70301d0bb67f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_b1fd941c-c7e4-4696-9f64-b3761d930920" xlink:to="loc_us-gaap_NondesignatedMember_19353610-8828-4bf1-96a9-70301d0bb67f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofDerivativeAssetsandLiabilitiesatFairValueDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofDerivativeAssetsandLiabilitiesatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofDerivativeAssetsandLiabilitiesatFairValueDetails" xlink:type="extended" id="i7dbc08b04cc747b9bd8c299f72c62ff8_DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofDerivativeAssetsandLiabilitiesatFairValueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_0f36c4e4-3f8f-4bb1-a384-7da368151690" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_b51641e9-de2d-4141-8221-29657dd0a5a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0f36c4e4-3f8f-4bb1-a384-7da368151690" xlink:to="loc_us-gaap_DerivativeAssets_b51641e9-de2d-4141-8221-29657dd0a5a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_c44bae07-d89b-45fd-942e-8221cbaa3696" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0f36c4e4-3f8f-4bb1-a384-7da368151690" xlink:to="loc_us-gaap_DerivativeLiabilities_c44bae07-d89b-45fd-942e-8221cbaa3696" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_3d2a8502-a200-4ff0-91de-138e8626a4a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_0f36c4e4-3f8f-4bb1-a384-7da368151690" xlink:to="loc_us-gaap_DerivativeTable_3d2a8502-a200-4ff0-91de-138e8626a4a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_e793277b-82a2-48e4-939f-6fd1129e99db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_3d2a8502-a200-4ff0-91de-138e8626a4a4" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_e793277b-82a2-48e4-939f-6fd1129e99db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_e793277b-82a2-48e4-939f-6fd1129e99db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_e793277b-82a2-48e4-939f-6fd1129e99db" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_e793277b-82a2-48e4-939f-6fd1129e99db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_cd680b9d-34fe-4276-82e5-68d77e3dcc8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_e793277b-82a2-48e4-939f-6fd1129e99db" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_cd680b9d-34fe-4276-82e5-68d77e3dcc8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_2ef0adfc-2054-456f-8add-5cefc5f91691" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_cd680b9d-34fe-4276-82e5-68d77e3dcc8e" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_2ef0adfc-2054-456f-8add-5cefc5f91691" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_0a4fdac5-420a-4ff7-85cf-6cee473faf38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_cd680b9d-34fe-4276-82e5-68d77e3dcc8e" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_0a4fdac5-420a-4ff7-85cf-6cee473faf38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_499d785a-e27a-4639-be06-c27c0c727ba4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_cd680b9d-34fe-4276-82e5-68d77e3dcc8e" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_499d785a-e27a-4639-be06-c27c0c727ba4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_94e6075d-6f36-4fab-846b-442faf33b6fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_cd680b9d-34fe-4276-82e5-68d77e3dcc8e" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_94e6075d-6f36-4fab-846b-442faf33b6fb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesAdditionalInformationDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DerivativeFinancialInstrumentsandHedgingActivitiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesAdditionalInformationDetails" xlink:type="extended" id="i02cdb94fb5f04ef2b888e43577fc44c8_DerivativeFinancialInstrumentsandHedgingActivitiesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_7c254816-5231-4f5e-9c47-3563a5ba81de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_DerivativeNumberOfCashFlowHedgesEnteredInto_e93d066a-cf76-46c8-9333-ec707f361950" xlink:href="flt-20220930.xsd#flt_DerivativeNumberOfCashFlowHedgesEnteredInto"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_7c254816-5231-4f5e-9c47-3563a5ba81de" xlink:to="loc_flt_DerivativeNumberOfCashFlowHedgesEnteredInto_e93d066a-cf76-46c8-9333-ec707f361950" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_b82e1cb7-054d-42c3-af6d-8d2aebd0f32e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_7c254816-5231-4f5e-9c47-3563a5ba81de" xlink:to="loc_us-gaap_DerivativeNotionalAmount_b82e1cb7-054d-42c3-af6d-8d2aebd0f32e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_59293bcc-4f1c-4f13-bc3d-e9d177f313f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_7c254816-5231-4f5e-9c47-3563a5ba81de" xlink:to="loc_us-gaap_LongTermDebt_59293bcc-4f1c-4f13-bc3d-e9d177f313f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_c16f1bbb-45d5-429a-b001-c2b451370dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_7c254816-5231-4f5e-9c47-3563a5ba81de" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_c16f1bbb-45d5-429a-b001-c2b451370dd2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_4ce7f3c5-e015-4135-8e82-7eef44f5c08f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_7c254816-5231-4f5e-9c47-3563a5ba81de" xlink:to="loc_us-gaap_DerivativeTable_4ce7f3c5-e015-4135-8e82-7eef44f5c08f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_7b62b773-40b9-43bf-98b8-e8ebf120fd7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_4ce7f3c5-e015-4135-8e82-7eef44f5c08f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_7b62b773-40b9-43bf-98b8-e8ebf120fd7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7b62b773-40b9-43bf-98b8-e8ebf120fd7d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7b62b773-40b9-43bf-98b8-e8ebf120fd7d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7b62b773-40b9-43bf-98b8-e8ebf120fd7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5157a2c7-105f-4146-8cc4-3ef63c40ea5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7b62b773-40b9-43bf-98b8-e8ebf120fd7d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5157a2c7-105f-4146-8cc4-3ef63c40ea5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_VariableRateDebtMember_22260eb5-1166-427c-9e51-eddcfb5abcfc" xlink:href="flt-20220930.xsd#flt_VariableRateDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5157a2c7-105f-4146-8cc4-3ef63c40ea5d" xlink:to="loc_flt_VariableRateDebtMember_22260eb5-1166-427c-9e51-eddcfb5abcfc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_6b8fca50-763d-4ff1-8c86-3513f51eb788" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_4ce7f3c5-e015-4135-8e82-7eef44f5c08f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_6b8fca50-763d-4ff1-8c86-3513f51eb788" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6b8fca50-763d-4ff1-8c86-3513f51eb788_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6b8fca50-763d-4ff1-8c86-3513f51eb788" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6b8fca50-763d-4ff1-8c86-3513f51eb788_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b4d23fd3-6c3f-412a-9e14-921a8af19549" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6b8fca50-763d-4ff1-8c86-3513f51eb788" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b4d23fd3-6c3f-412a-9e14-921a8af19549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_5b3236e0-beeb-417b-af89-13b1b6c96dbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b4d23fd3-6c3f-412a-9e14-921a8af19549" xlink:to="loc_us-gaap_InterestRateSwapMember_5b3236e0-beeb-417b-af89-13b1b6c96dbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_InterestRateSwap3Member_b095f1c9-c806-4f7c-9005-d94f5a6ec6e9" xlink:href="flt-20220930.xsd#flt_InterestRateSwap3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b4d23fd3-6c3f-412a-9e14-921a8af19549" xlink:to="loc_flt_InterestRateSwap3Member_b095f1c9-c806-4f7c-9005-d94f5a6ec6e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_fb479271-6a5d-49d1-8c37-ceb373b83399" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_4ce7f3c5-e015-4135-8e82-7eef44f5c08f" xlink:to="loc_us-gaap_HedgingDesignationAxis_fb479271-6a5d-49d1-8c37-ceb373b83399" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_fb479271-6a5d-49d1-8c37-ceb373b83399_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_fb479271-6a5d-49d1-8c37-ceb373b83399" xlink:to="loc_us-gaap_HedgingDesignationDomain_fb479271-6a5d-49d1-8c37-ceb373b83399_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_d27be0e3-68ab-4d98-a0ce-0b847123f15a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_fb479271-6a5d-49d1-8c37-ceb373b83399" xlink:to="loc_us-gaap_HedgingDesignationDomain_d27be0e3-68ab-4d98-a0ce-0b847123f15a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_5ac7474c-d468-41ca-9b12-d4919b307a56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_d27be0e3-68ab-4d98-a0ce-0b847123f15a" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_5ac7474c-d468-41ca-9b12-d4919b307a56" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofCashFlowHedgeNotionalAmountsDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofCashFlowHedgeNotionalAmountsDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofCashFlowHedgeNotionalAmountsDetails" xlink:type="extended" id="i8c0541f823f54c07950a417aea16741c_DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofCashFlowHedgeNotionalAmountsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_5fbd27d5-25f1-4df6-806a-63c182a25e42" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_b86b2ab7-a04f-47ac-8426-c63d73fbe049" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5fbd27d5-25f1-4df6-806a-63c182a25e42" xlink:to="loc_us-gaap_DerivativeNotionalAmount_b86b2ab7-a04f-47ac-8426-c63d73fbe049" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_DerivativeInstrumentInterestRateStatedPercentage_b7870d6c-1056-412e-8782-d7cb0ffdfda5" xlink:href="flt-20220930.xsd#flt_DerivativeInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5fbd27d5-25f1-4df6-806a-63c182a25e42" xlink:to="loc_flt_DerivativeInstrumentInterestRateStatedPercentage_b7870d6c-1056-412e-8782-d7cb0ffdfda5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_64f1301c-1b67-468e-8e3b-52162465e4a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_5fbd27d5-25f1-4df6-806a-63c182a25e42" xlink:to="loc_us-gaap_DerivativeTable_64f1301c-1b67-468e-8e3b-52162465e4a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_b46bb61d-1a1f-4a94-b7b8-80db3a28af12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_64f1301c-1b67-468e-8e3b-52162465e4a6" xlink:to="loc_us-gaap_HedgingDesignationAxis_b46bb61d-1a1f-4a94-b7b8-80db3a28af12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_b46bb61d-1a1f-4a94-b7b8-80db3a28af12_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_b46bb61d-1a1f-4a94-b7b8-80db3a28af12" xlink:to="loc_us-gaap_HedgingDesignationDomain_b46bb61d-1a1f-4a94-b7b8-80db3a28af12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_53b16605-8378-4b36-a60a-1185b50ec671" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_b46bb61d-1a1f-4a94-b7b8-80db3a28af12" xlink:to="loc_us-gaap_HedgingDesignationDomain_53b16605-8378-4b36-a60a-1185b50ec671" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_db5ec8fd-8452-40b7-9641-b4db4651e2de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_53b16605-8378-4b36-a60a-1185b50ec671" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_db5ec8fd-8452-40b7-9641-b4db4651e2de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_0fe08c75-8ded-40c1-9a03-9664b713c6e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_64f1301c-1b67-468e-8e3b-52162465e4a6" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_0fe08c75-8ded-40c1-9a03-9664b713c6e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_0fe08c75-8ded-40c1-9a03-9664b713c6e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0fe08c75-8ded-40c1-9a03-9664b713c6e4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_0fe08c75-8ded-40c1-9a03-9664b713c6e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_667f34ed-6d82-4ea1-aaf5-fef41df7af09" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0fe08c75-8ded-40c1-9a03-9664b713c6e4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_667f34ed-6d82-4ea1-aaf5-fef41df7af09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_InterestRateSwap2Member_a6b403ca-8ef2-4738-995b-0cea9cd686e0" xlink:href="flt-20220930.xsd#flt_InterestRateSwap2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_667f34ed-6d82-4ea1-aaf5-fef41df7af09" xlink:to="loc_flt_InterestRateSwap2Member_a6b403ca-8ef2-4738-995b-0cea9cd686e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_flt_InterestRateSwap3Member_fbb6affb-f7da-4e1f-a0cd-ef95e2efd18a" xlink:href="flt-20220930.xsd#flt_InterestRateSwap3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_667f34ed-6d82-4ea1-aaf5-fef41df7af09" xlink:to="loc_flt_InterestRateSwap3Member_fbb6affb-f7da-4e1f-a0cd-ef95e2efd18a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValueandBalanceSheetLocationDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValueandBalanceSheetLocationDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValueandBalanceSheetLocationDetails" xlink:type="extended" id="ib9c5dca687b743358ae62c92c92c651e_DerivativeFinancialInstrumentsandHedgingActivitiesScheduleofFairValueandBalanceSheetLocationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_71e2eba4-0122-4573-b6cb-1728915e6b8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_c2270694-fff4-488c-b561-644e67ba2adf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_71e2eba4-0122-4573-b6cb-1728915e6b8f" xlink:to="loc_us-gaap_DerivativeAssets_c2270694-fff4-488c-b561-644e67ba2adf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_b3abaf38-6d26-4d78-9cc4-870cd3e4eea6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_71e2eba4-0122-4573-b6cb-1728915e6b8f" xlink:to="loc_us-gaap_DerivativeLiabilities_b3abaf38-6d26-4d78-9cc4-870cd3e4eea6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_9df1a080-e162-4d98-8da5-31c60ae89534" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_71e2eba4-0122-4573-b6cb-1728915e6b8f" xlink:to="loc_us-gaap_DerivativeTable_9df1a080-e162-4d98-8da5-31c60ae89534" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_0696d556-f68b-4848-b4d0-92a6a534de8d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_9df1a080-e162-4d98-8da5-31c60ae89534" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_0696d556-f68b-4848-b4d0-92a6a534de8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_0696d556-f68b-4848-b4d0-92a6a534de8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_0696d556-f68b-4848-b4d0-92a6a534de8d" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_0696d556-f68b-4848-b4d0-92a6a534de8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_a2751fc8-fe48-4222-98cb-82c9fef066c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_0696d556-f68b-4848-b4d0-92a6a534de8d" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_a2751fc8-fe48-4222-98cb-82c9fef066c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_8552afb3-e76c-4364-a826-929fd662bdfa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a2751fc8-fe48-4222-98cb-82c9fef066c3" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_8552afb3-e76c-4364-a826-929fd662bdfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_3d94d1c5-48a3-4316-bb26-6d1f4bf4780b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a2751fc8-fe48-4222-98cb-82c9fef066c3" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_3d94d1c5-48a3-4316-bb26-6d1f4bf4780b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_88af6235-4307-4990-b241-153e0de6965c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a2751fc8-fe48-4222-98cb-82c9fef066c3" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_88af6235-4307-4990-b241-153e0de6965c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_cd9f1850-e7d9-4302-b7f8-d3de2f969124" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a2751fc8-fe48-4222-98cb-82c9fef066c3" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_cd9f1850-e7d9-4302-b7f8-d3de2f969124" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_74604bd8-8a9e-43e6-995f-8748df8c5820" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_9df1a080-e162-4d98-8da5-31c60ae89534" xlink:to="loc_us-gaap_HedgingDesignationAxis_74604bd8-8a9e-43e6-995f-8748df8c5820" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_74604bd8-8a9e-43e6-995f-8748df8c5820_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_74604bd8-8a9e-43e6-995f-8748df8c5820" xlink:to="loc_us-gaap_HedgingDesignationDomain_74604bd8-8a9e-43e6-995f-8748df8c5820_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_82296d84-ad50-42ea-9197-08257306fb31" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_74604bd8-8a9e-43e6-995f-8748df8c5820" xlink:to="loc_us-gaap_HedgingDesignationDomain_82296d84-ad50-42ea-9197-08257306fb31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_5ec0ba4d-d9f7-44c1-9674-d0cf967505f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_82296d84-ad50-42ea-9197-08257306fb31" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_5ec0ba4d-d9f7-44c1-9674-d0cf967505f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_c050ff4d-4d18-4ea5-aed1-6d0c1b7dfe53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_9df1a080-e162-4d98-8da5-31c60ae89534" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_c050ff4d-4d18-4ea5-aed1-6d0c1b7dfe53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_c050ff4d-4d18-4ea5-aed1-6d0c1b7dfe53_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_c050ff4d-4d18-4ea5-aed1-6d0c1b7dfe53" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_c050ff4d-4d18-4ea5-aed1-6d0c1b7dfe53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_08477b41-1850-419d-beb6-88e947493cb6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_c050ff4d-4d18-4ea5-aed1-6d0c1b7dfe53" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_08477b41-1850-419d-beb6-88e947493cb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_b6f8bac1-c2b8-439d-b6cb-c69465bf591b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_08477b41-1850-419d-beb6-88e947493cb6" xlink:to="loc_us-gaap_InterestRateSwapMember_b6f8bac1-c2b8-439d-b6cb-c69465bf591b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fleetcor.com/role/AccumulatedOtherComprehensiveLossAOCLDetails" xlink:type="simple" xlink:href="flt-20220930.xsd#AccumulatedOtherComprehensiveLossAOCLDetails"/>
  <link:definitionLink xlink:role="http://www.fleetcor.com/role/AccumulatedOtherComprehensiveLossAOCLDetails" xlink:type="extended" id="id68594c284604f159589f15d3f7aee74_AccumulatedOtherComprehensiveLossAOCLDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_c155f8e2-36e7-46a6-b1c8-86b54686e906" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_21d9611b-8bd7-42bb-a2f0-bd068a6546c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_c155f8e2-36e7-46a6-b1c8-86b54686e906" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_21d9611b-8bd7-42bb-a2f0-bd068a6546c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_7bb3b147-6dcd-43e6-8f77-4ad1cd23b60c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_21d9611b-8bd7-42bb-a2f0-bd068a6546c9" xlink:to="loc_us-gaap_StockholdersEquity_7bb3b147-6dcd-43e6-8f77-4ad1cd23b60c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_f1d0a8d4-b1a8-4f55-b064-46cbd6b43aac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_21d9611b-8bd7-42bb-a2f0-bd068a6546c9" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_f1d0a8d4-b1a8-4f55-b064-46cbd6b43aac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_3246064c-d8ea-44eb-9ca1-8123f210551b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_21d9611b-8bd7-42bb-a2f0-bd068a6546c9" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_3246064c-d8ea-44eb-9ca1-8123f210551b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_3353a9cd-522c-4818-8054-249c3ef7f5ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_21d9611b-8bd7-42bb-a2f0-bd068a6546c9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_3353a9cd-522c-4818-8054-249c3ef7f5ec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ac5ea63c-97a7-4f02-825f-31a17fc6156f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_21d9611b-8bd7-42bb-a2f0-bd068a6546c9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ac5ea63c-97a7-4f02-825f-31a17fc6156f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_24336a3e-f28f-4734-92fd-e781d53fd9be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_2a4af80e-3c04-4d83-87bf-a9afe1223dcd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_c155f8e2-36e7-46a6-b1c8-86b54686e906" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_2a4af80e-3c04-4d83-87bf-a9afe1223dcd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_98c4511a-bbda-49d5-ab04-66b21864819c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_2a4af80e-3c04-4d83-87bf-a9afe1223dcd" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_98c4511a-bbda-49d5-ab04-66b21864819c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_98c4511a-bbda-49d5-ab04-66b21864819c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_98c4511a-bbda-49d5-ab04-66b21864819c" xlink:to="loc_us-gaap_EquityComponentDomain_98c4511a-bbda-49d5-ab04-66b21864819c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_fde51a99-b33a-4a4c-8d07-c9f9b7c3a990" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_98c4511a-bbda-49d5-ab04-66b21864819c" xlink:to="loc_us-gaap_EquityComponentDomain_fde51a99-b33a-4a4c-8d07-c9f9b7c3a990" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_897f4215-817d-466f-a8c0-0273d136b50a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_fde51a99-b33a-4a4c-8d07-c9f9b7c3a990" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_897f4215-817d-466f-a8c0-0273d136b50a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_be4030c5-bea6-4204-a407-31c4eba99387" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_897f4215-817d-466f-a8c0-0273d136b50a" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_be4030c5-bea6-4204-a407-31c4eba99387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_70630e07-b0cc-4b80-9c39-f065697da781" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_897f4215-817d-466f-a8c0-0273d136b50a" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_70630e07-b0cc-4b80-9c39-f065697da781" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_AccountsPayableCurrent" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
