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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:aeb2cc85-a104-47ed-a570-27ae6c8da358,g:e05a0a8b-f5ef-404d-9067-45ec19c8d46f-->
<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.caseys.com/role/ConsolidatedStatementsofShareholdersEquity" xlink:type="simple" xlink:href="casy-20250430.xsd#ConsolidatedStatementsofShareholdersEquity"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/ConsolidatedStatementsofShareholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_dd368151-778b-4e0f-9dc5-0755e7df93b6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2a8ad3e7-c365-420a-b140-504af126d77c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_dd368151-778b-4e0f-9dc5-0755e7df93b6" xlink:to="loc_us-gaap_StatementTable_2a8ad3e7-c365-420a-b140-504af126d77c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_d3767559-0bc1-44d4-9e03-391de61b5fde" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2a8ad3e7-c365-420a-b140-504af126d77c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_d3767559-0bc1-44d4-9e03-391de61b5fde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d3767559-0bc1-44d4-9e03-391de61b5fde_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d3767559-0bc1-44d4-9e03-391de61b5fde" xlink:to="loc_us-gaap_EquityComponentDomain_d3767559-0bc1-44d4-9e03-391de61b5fde_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7fe89d40-d7dc-4fd4-91e7-0fe270d9a4b4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d3767559-0bc1-44d4-9e03-391de61b5fde" xlink:to="loc_us-gaap_EquityComponentDomain_7fe89d40-d7dc-4fd4-91e7-0fe270d9a4b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_23d54bc0-ce4b-4ec2-ba7d-73504e478a9f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7fe89d40-d7dc-4fd4-91e7-0fe270d9a4b4" xlink:to="loc_us-gaap_CommonStockMember_23d54bc0-ce4b-4ec2-ba7d-73504e478a9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_3cbc7ae8-2ea7-40a1-a0fa-6a1079bc9419" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7fe89d40-d7dc-4fd4-91e7-0fe270d9a4b4" xlink:to="loc_us-gaap_RetainedEarningsMember_3cbc7ae8-2ea7-40a1-a0fa-6a1079bc9419" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dd368151-778b-4e0f-9dc5-0755e7df93b6" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_16fe0d42-7e07-48f7-9bd4-5f3a719a03ab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_16fe0d42-7e07-48f7-9bd4-5f3a719a03ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fd3ace05-2b59-4dab-9d6f-e4313f10dd87" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_StockholdersEquity_fd3ace05-2b59-4dab-9d6f-e4313f10dd87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_ccef19f6-eceb-4657-ab6f-37abc0009012" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_NetIncomeLoss_ccef19f6-eceb-4657-ab6f-37abc0009012" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_37b9b388-5680-4d09-b140-fcb5a53dd538" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_DividendsCommonStock_37b9b388-5680-4d09-b140-fcb5a53dd538" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_8c5c6d06-5ae3-4ea6-88c7-5e67b40af09f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_8c5c6d06-5ae3-4ea6-88c7-5e67b40af09f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_8104ee67-7da9-49d0-8d4f-7a521b2752d3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_8104ee67-7da9-49d0-8d4f-7a521b2752d3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_d83d1606-833c-428d-a301-94aa1ea992d8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_d83d1606-833c-428d-a301-94aa1ea992d8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_46bcc8a2-aa16-40ab-8c40-2c3eefdfc75e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_751c3bdd-5215-4bc4-bfce-9c83f59d2bf6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_46bcc8a2-aa16-40ab-8c40-2c3eefdfc75e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_345f527f-b41a-4d2e-8d5c-cf6b07fa1b33" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_494291bc-85df-4132-b1cf-443cb210bed8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/ConsolidatedStatementsofShareholdersEquityParentheticals" xlink:type="simple" xlink:href="casy-20250430.xsd#ConsolidatedStatementsofShareholdersEquityParentheticals"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/ConsolidatedStatementsofShareholdersEquityParentheticals" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_48c70ef6-04bc-4b2e-8c5c-7e2976dc3d3c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_75413c25-fc11-481d-8ee5-4321e5e8f293" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_48c70ef6-04bc-4b2e-8c5c-7e2976dc3d3c" xlink:to="loc_us-gaap_StatementTable_75413c25-fc11-481d-8ee5-4321e5e8f293" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_baf75235-ea31-438a-ba5b-81f5625d0dc5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_75413c25-fc11-481d-8ee5-4321e5e8f293" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_baf75235-ea31-438a-ba5b-81f5625d0dc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_baf75235-ea31-438a-ba5b-81f5625d0dc5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_baf75235-ea31-438a-ba5b-81f5625d0dc5" xlink:to="loc_us-gaap_EquityComponentDomain_baf75235-ea31-438a-ba5b-81f5625d0dc5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_4a9eb754-4909-4f3b-8087-2614ffcf45e6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_baf75235-ea31-438a-ba5b-81f5625d0dc5" xlink:to="loc_us-gaap_EquityComponentDomain_4a9eb754-4909-4f3b-8087-2614ffcf45e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_89c4d09b-8623-4a08-b8a4-d47a0fb39261" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4a9eb754-4909-4f3b-8087-2614ffcf45e6" xlink:to="loc_us-gaap_RetainedEarningsMember_89c4d09b-8623-4a08-b8a4-d47a0fb39261" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_d9d6475f-da74-4f33-8539-40f4e00f104e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_48c70ef6-04bc-4b2e-8c5c-7e2976dc3d3c" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_d9d6475f-da74-4f33-8539-40f4e00f104e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#SignificantAccountingPoliciesDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/SignificantAccountingPoliciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_cca2a725-aeef-464a-a183-904102406c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_ConcentrationRiskTable_cca2a725-aeef-464a-a183-904102406c4b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f316c237-a155-4ec2-bf24-d26240bac54c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_cca2a725-aeef-464a-a183-904102406c4b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f316c237-a155-4ec2-bf24-d26240bac54c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f316c237-a155-4ec2-bf24-d26240bac54c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f316c237-a155-4ec2-bf24-d26240bac54c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f316c237-a155-4ec2-bf24-d26240bac54c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a7f16349-77ea-41ba-a773-b3b24f1bdb3c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f316c237-a155-4ec2-bf24-d26240bac54c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a7f16349-77ea-41ba-a773-b3b24f1bdb3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_6aca3008-be87-47ad-b98c-915b633ca41b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a7f16349-77ea-41ba-a773-b3b24f1bdb3c" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_6aca3008-be87-47ad-b98c-915b633ca41b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_d38b6167-5129-44bf-9401-25cf317c3588" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a7f16349-77ea-41ba-a773-b3b24f1bdb3c" xlink:to="loc_us-gaap_CustomerRelationshipsMember_d38b6167-5129-44bf-9401-25cf317c3588" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_fae237bd-8d28-49f8-972f-b4ef49173864" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_cca2a725-aeef-464a-a183-904102406c4b" xlink:to="loc_srt_RangeAxis_fae237bd-8d28-49f8-972f-b4ef49173864" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fae237bd-8d28-49f8-972f-b4ef49173864_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_fae237bd-8d28-49f8-972f-b4ef49173864" xlink:to="loc_srt_RangeMember_fae237bd-8d28-49f8-972f-b4ef49173864_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9a667f66-4991-4527-832a-1d46b38b8e86" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_fae237bd-8d28-49f8-972f-b4ef49173864" xlink:to="loc_srt_RangeMember_9a667f66-4991-4527-832a-1d46b38b8e86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_5c415b1c-cbad-45f9-8bb7-c101c41f0494" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9a667f66-4991-4527-832a-1d46b38b8e86" xlink:to="loc_srt_MinimumMember_5c415b1c-cbad-45f9-8bb7-c101c41f0494" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_75beecfb-1441-4762-ae12-14a300c1fb58" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9a667f66-4991-4527-832a-1d46b38b8e86" xlink:to="loc_srt_MaximumMember_75beecfb-1441-4762-ae12-14a300c1fb58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue_b4d9bcde-6b04-408f-9655-8f6e937e9ddc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue_b4d9bcde-6b04-408f-9655-8f6e937e9ddc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_585e7e64-49f9-4c14-9753-98331a9d0ab3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_585e7e64-49f9-4c14-9753-98331a9d0ab3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_a42be160-443b-48e1-a773-03063027fafb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_a42be160-443b-48e1-a773-03063027fafb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_bcde4923-004f-4963-8ae1-0684d2561d18" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_bcde4923-004f-4963-8ae1-0684d2561d18" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_14bff3ba-aa6c-4eb0-975c-e7128c3d8888" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_Goodwill_14bff3ba-aa6c-4eb0-975c-e7128c3d8888" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_c79d986c-a21d-462e-8330-6b52af06821c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_c79d986c-a21d-462e-8330-6b52af06821c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_a11bb039-49ea-419c-8d67-5f732e7c84da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_a11bb039-49ea-419c-8d67-5f732e7c84da" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bcc23872-d678-41ba-a9dc-a9147f5f1c9d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bcc23872-d678-41ba-a9dc-a9147f5f1c9d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_12660caf-8d35-4059-911c-d3dd55136155" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_12660caf-8d35-4059-911c-d3dd55136155" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_d952f68d-0073-486b-be99-292c7813c7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_d952f68d-0073-486b-be99-292c7813c7ac" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_5394d54b-2a68-4845-96be-69c3c89650bc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_5394d54b-2a68-4845-96be-69c3c89650bc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_abeda944-5324-4e1c-95c5-3bc11dc8bd42" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_abeda944-5324-4e1c-95c5-3bc11dc8bd42" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_2760c8d1-7cc9-4427-a18e-61d84d249d01" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_2760c8d1-7cc9-4427-a18e-61d84d249d01" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_643f8991-9c96-4f85-ac21-7249a42fe4db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_AssetImpairmentCharges_643f8991-9c96-4f85-ac21-7249a42fe4db" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_9523efb2-d63c-4a66-b508-e07f65149880" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_ContractWithCustomerLiability_9523efb2-d63c-4a66-b508-e07f65149880" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_16dc7747-0ad5-49c7-ab3d-7c3f074b8fec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetRetirementObligationsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_AssetRetirementObligationsNoncurrent_16dc7747-0ad5-49c7-ab3d-7c3f074b8fec" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserve_8c14490e-4790-4648-8227-846342b41de5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SelfInsuranceReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_SelfInsuranceReserve_8c14490e-4790-4648-8227-846342b41de5" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_03862d66-ff4f-409b-8293-be06e6db8c52" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_64565ae6-6b13-4a6a-a4f5-b06aefc671e8" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_03862d66-ff4f-409b-8293-be06e6db8c52" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesAccountsReceivablesbyTypeDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#SignificantAccountingPoliciesAccountsReceivablesbyTypeDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/SignificantAccountingPoliciesAccountsReceivablesbyTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_21cef8db-2b57-4137-b519-ced33292f6ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_89002cd3-16f3-44a2-9f58-62f724db6773" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_21cef8db-2b57-4137-b519-ced33292f6ea" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_89002cd3-16f3-44a2-9f58-62f724db6773" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ba914d62-cd71-4fa6-b652-e11e4cd151b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_89002cd3-16f3-44a2-9f58-62f724db6773" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ba914d62-cd71-4fa6-b652-e11e4cd151b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_ba914d62-cd71-4fa6-b652-e11e4cd151b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ba914d62-cd71-4fa6-b652-e11e4cd151b9" xlink:to="loc_us-gaap_ReceivableTypeDomain_ba914d62-cd71-4fa6-b652-e11e4cd151b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_034bb346-c0eb-4cc0-90d2-3b68032c352f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ba914d62-cd71-4fa6-b652-e11e4cd151b9" xlink:to="loc_us-gaap_ReceivableTypeDomain_034bb346-c0eb-4cc0-90d2-3b68032c352f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_VendorRebatesMember_071ff862-132e-4eae-a7f7-2a9378d21696" xlink:href="casy-20250430.xsd#casy_VendorRebatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_034bb346-c0eb-4cc0-90d2-3b68032c352f" xlink:to="loc_casy_VendorRebatesMember_071ff862-132e-4eae-a7f7-2a9378d21696" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_c4345595-abdc-4647-9464-95f2eb0958c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_034bb346-c0eb-4cc0-90d2-3b68032c352f" xlink:to="loc_us-gaap_CreditCardReceivablesMember_c4345595-abdc-4647-9464-95f2eb0958c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_OtherReceivablesMember_17ce9d49-7c1b-4356-b262-a1005bd8e84f" xlink:href="casy-20250430.xsd#casy_OtherReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_034bb346-c0eb-4cc0-90d2-3b68032c352f" xlink:to="loc_casy_OtherReceivablesMember_17ce9d49-7c1b-4356-b262-a1005bd8e84f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_c5ee3f1b-25af-45ac-b0e5-ecbb30788ab0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_21cef8db-2b57-4137-b519-ced33292f6ea" xlink:to="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_c5ee3f1b-25af-45ac-b0e5-ecbb30788ab0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesSummaryoftheInventoryValuesDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#SignificantAccountingPoliciesSummaryoftheInventoryValuesDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/SignificantAccountingPoliciesSummaryoftheInventoryValuesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryLineItems_07ae46e1-87c1-4816-b871-9c79be362f18" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryCurrentTable_c7fb0577-a8df-4e84-a5d2-f1c86bf023b7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryCurrentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_InventoryLineItems_07ae46e1-87c1-4816-b871-9c79be362f18" xlink:to="loc_us-gaap_InventoryCurrentTable_c7fb0577-a8df-4e84-a5d2-f1c86bf023b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_18a65432-0558-45f3-b303-ef795e046f02" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_InventoryCurrentTable_c7fb0577-a8df-4e84-a5d2-f1c86bf023b7" xlink:to="loc_srt_ProductOrServiceAxis_18a65432-0558-45f3-b303-ef795e046f02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_18a65432-0558-45f3-b303-ef795e046f02_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_18a65432-0558-45f3-b303-ef795e046f02" xlink:to="loc_srt_ProductsAndServicesDomain_18a65432-0558-45f3-b303-ef795e046f02_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_51592ac6-e848-4a91-877d-eaf8a1bcfa77" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_18a65432-0558-45f3-b303-ef795e046f02" xlink:to="loc_srt_ProductsAndServicesDomain_51592ac6-e848-4a91-877d-eaf8a1bcfa77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_GasolineMember_28e8062b-a521-48fb-8b6b-0ca134df26dd" xlink:href="casy-20250430.xsd#casy_GasolineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_51592ac6-e848-4a91-877d-eaf8a1bcfa77" xlink:to="loc_casy_GasolineMember_28e8062b-a521-48fb-8b6b-0ca134df26dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_MerchandiseMember_1d2b7d89-9db4-4bdd-9826-e60c81f51776" xlink:href="casy-20250430.xsd#casy_MerchandiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_51592ac6-e848-4a91-877d-eaf8a1bcfa77" xlink:to="loc_casy_MerchandiseMember_1d2b7d89-9db4-4bdd-9826-e60c81f51776" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryGross_08f56ced-de10-4c51-8e4f-3627686f4103" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_07ae46e1-87c1-4816-b871-9c79be362f18" xlink:to="loc_us-gaap_InventoryGross_08f56ced-de10-4c51-8e4f-3627686f4103" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesDepreciationofPropertyandEquipmentandAmortizationofCapitalLeaseAssetsDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#SignificantAccountingPoliciesDepreciationofPropertyandEquipmentandAmortizationofCapitalLeaseAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/SignificantAccountingPoliciesDepreciationofPropertyandEquipmentandAmortizationofCapitalLeaseAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_39a8a966-7c44-4321-81bc-ea5fad466d1d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a73dad18-858a-4966-86bf-3a5e6b1bb092" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_39a8a966-7c44-4321-81bc-ea5fad466d1d" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a73dad18-858a-4966-86bf-3a5e6b1bb092" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_c7c52f55-6680-48f4-9f1a-6bfcd11c39ac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a73dad18-858a-4966-86bf-3a5e6b1bb092" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_c7c52f55-6680-48f4-9f1a-6bfcd11c39ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c7c52f55-6680-48f4-9f1a-6bfcd11c39ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_c7c52f55-6680-48f4-9f1a-6bfcd11c39ac" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c7c52f55-6680-48f4-9f1a-6bfcd11c39ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6ea059e2-f25e-47d4-b340-a4ef620c983a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_c7c52f55-6680-48f4-9f1a-6bfcd11c39ac" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6ea059e2-f25e-47d4-b340-a4ef620c983a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_501b15b0-b47d-40f8-a5b2-f42550f3d264" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6ea059e2-f25e-47d4-b340-a4ef620c983a" xlink:to="loc_us-gaap_BuildingMember_501b15b0-b47d-40f8-a5b2-f42550f3d264" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandImprovementsMember_6f2ae3ad-4bb7-438f-a1b9-05cfdd3dff1f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LandImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6ea059e2-f25e-47d4-b340-a4ef620c983a" xlink:to="loc_us-gaap_LandImprovementsMember_6f2ae3ad-4bb7-438f-a1b9-05cfdd3dff1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_5e572e17-f542-4410-875f-f6dab0101388" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6ea059e2-f25e-47d4-b340-a4ef620c983a" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_5e572e17-f542-4410-875f-f6dab0101388" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_a28eaddf-2228-47f3-a98d-8b037eb9eb8d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a73dad18-858a-4966-86bf-3a5e6b1bb092" xlink:to="loc_srt_RangeAxis_a28eaddf-2228-47f3-a98d-8b037eb9eb8d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a28eaddf-2228-47f3-a98d-8b037eb9eb8d_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_a28eaddf-2228-47f3-a98d-8b037eb9eb8d" xlink:to="loc_srt_RangeMember_a28eaddf-2228-47f3-a98d-8b037eb9eb8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ed52352c-336b-4e6e-953b-0f221e47855d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_a28eaddf-2228-47f3-a98d-8b037eb9eb8d" xlink:to="loc_srt_RangeMember_ed52352c-336b-4e6e-953b-0f221e47855d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6e21daa0-0e3c-48cc-92a5-6a9206a9a68a" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ed52352c-336b-4e6e-953b-0f221e47855d" xlink:to="loc_srt_MinimumMember_6e21daa0-0e3c-48cc-92a5-6a9206a9a68a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b84a06f0-3a7e-42d2-90ed-196895b2ed11" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ed52352c-336b-4e6e-953b-0f221e47855d" xlink:to="loc_srt_MaximumMember_b84a06f0-3a7e-42d2-90ed-196895b2ed11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_09ed0676-29d9-4332-a00c-6036a9d9017d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_39a8a966-7c44-4321-81bc-ea5fad466d1d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_09ed0676-29d9-4332-a00c-6036a9d9017d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/AcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_de844d7d-a1f5-462e-a652-5ac5848b3b6e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_de844d7d-a1f5-462e-a652-5ac5848b3b6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_2c01f1dd-cd27-4729-9dd0-ffd7d47fdf6a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_de844d7d-a1f5-462e-a652-5ac5848b3b6e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_2c01f1dd-cd27-4729-9dd0-ffd7d47fdf6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2c01f1dd-cd27-4729-9dd0-ffd7d47fdf6a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2c01f1dd-cd27-4729-9dd0-ffd7d47fdf6a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2c01f1dd-cd27-4729-9dd0-ffd7d47fdf6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb667904-3ffa-43a6-8c7a-de0c5269a381" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2c01f1dd-cd27-4729-9dd0-ffd7d47fdf6a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb667904-3ffa-43a6-8c7a-de0c5269a381" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_FikesWholesaleMember_2e7decf6-2bd1-4051-a46a-8e48e4d4fd8b" xlink:href="casy-20250430.xsd#casy_FikesWholesaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb667904-3ffa-43a6-8c7a-de0c5269a381" xlink:to="loc_casy_FikesWholesaleMember_2e7decf6-2bd1-4051-a46a-8e48e4d4fd8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_7a9e7937-9055-47a3-9ed2-76bdde68abd2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb667904-3ffa-43a6-8c7a-de0c5269a381" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_7a9e7937-9055-47a3-9ed2-76bdde68abd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_f13cd64c-75a5-45fb-82c6-aee77a8fb1e0" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_de844d7d-a1f5-462e-a652-5ac5848b3b6e" xlink:to="loc_srt_StatementGeographicalAxis_f13cd64c-75a5-45fb-82c6-aee77a8fb1e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_f13cd64c-75a5-45fb-82c6-aee77a8fb1e0_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_f13cd64c-75a5-45fb-82c6-aee77a8fb1e0" xlink:to="loc_srt_SegmentGeographicalDomain_f13cd64c-75a5-45fb-82c6-aee77a8fb1e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_b2d8b6cc-53e3-4a05-ac3d-ecf879094dd4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_f13cd64c-75a5-45fb-82c6-aee77a8fb1e0" xlink:to="loc_srt_SegmentGeographicalDomain_b2d8b6cc-53e3-4a05-ac3d-ecf879094dd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_TX_4ec4a6e8-8199-4360-ae40-94874af5dbec" xlink:href="https://xbrl.sec.gov/stpr/2024/stpr-2024.xsd#stpr_TX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_b2d8b6cc-53e3-4a05-ac3d-ecf879094dd4" xlink:to="loc_stpr_TX_4ec4a6e8-8199-4360-ae40-94874af5dbec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_AlabamaFloridaAndMississippiMember_7a6e1597-af6e-4bd2-9672-5c2e0dca310e" xlink:href="casy-20250430.xsd#casy_AlabamaFloridaAndMississippiMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_b2d8b6cc-53e3-4a05-ac3d-ecf879094dd4" xlink:to="loc_casy_AlabamaFloridaAndMississippiMember_7a6e1597-af6e-4bd2-9672-5c2e0dca310e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_eadcbbba-3ca4-4caa-9a00-70a74c6dc928" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_de844d7d-a1f5-462e-a652-5ac5848b3b6e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_eadcbbba-3ca4-4caa-9a00-70a74c6dc928" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_eadcbbba-3ca4-4caa-9a00-70a74c6dc928_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_eadcbbba-3ca4-4caa-9a00-70a74c6dc928" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_eadcbbba-3ca4-4caa-9a00-70a74c6dc928_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bc53e583-103f-4614-a018-dfd76535a08c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_eadcbbba-3ca4-4caa-9a00-70a74c6dc928" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bc53e583-103f-4614-a018-dfd76535a08c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_168e4431-74eb-433e-925e-15d005cc16d4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bc53e583-103f-4614-a018-dfd76535a08c" xlink:to="loc_us-gaap_CustomerRelationshipsMember_168e4431-74eb-433e-925e-15d005cc16d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_84e0e544-bb29-4782-b078-8e28c5680384" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bc53e583-103f-4614-a018-dfd76535a08c" xlink:to="loc_us-gaap_TradeNamesMember_84e0e544-bb29-4782-b078-8e28c5680384" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_bc0e45e0-610e-4c1e-8f09-da737174e5b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_bc0e45e0-610e-4c1e-8f09-da737174e5b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits_08ae0615-b8c5-49ee-96a4-0f60980c4895" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits_08ae0615-b8c5-49ee-96a4-0f60980c4895" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfStores_5f3a285d-86d5-4e11-bd3a-bcbb39b2396b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfStores"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_NumberOfStores_5f3a285d-86d5-4e11-bd3a-bcbb39b2396b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_b250ab06-931c-4506-89fb-75b2ed33f653" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_Goodwill_b250ab06-931c-4506-89fb-75b2ed33f653" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_129dec95-4eee-4962-b031-f606844fd55f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_129dec95-4eee-4962-b031-f606844fd55f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_1f4d1890-d743-47ec-9a0d-895d0246e5d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_1f4d1890-d743-47ec-9a0d-895d0246e5d6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_1b35eaf0-6f7b-4f45-af15-f5328aeced6d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_1b35eaf0-6f7b-4f45-af15-f5328aeced6d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_c8c32bab-7f69-40e1-bc6d-80c441188a53" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3aedeaf7-8de8-4c1d-8905-b0df3488fbf1" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_c8c32bab-7f69-40e1-bc6d-80c441188a53" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/AcquisitionsAllocationofPurchasePriceDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#AcquisitionsAllocationofPurchasePriceDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/AcquisitionsAllocationofPurchasePriceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_186110c3-27d2-4035-8fc7-9189350b7f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5120cab5-75b2-4f8d-8926-a60f53ed7ebf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_186110c3-27d2-4035-8fc7-9189350b7f7c" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5120cab5-75b2-4f8d-8926-a60f53ed7ebf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7a220fa7-b781-43bf-a40e-f6593031f349" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5120cab5-75b2-4f8d-8926-a60f53ed7ebf" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7a220fa7-b781-43bf-a40e-f6593031f349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a220fa7-b781-43bf-a40e-f6593031f349_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7a220fa7-b781-43bf-a40e-f6593031f349" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a220fa7-b781-43bf-a40e-f6593031f349_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_bc4d9075-cab6-46b8-83b4-f2f9dfc1bd99" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7a220fa7-b781-43bf-a40e-f6593031f349" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_bc4d9075-cab6-46b8-83b4-f2f9dfc1bd99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_FikesWholesaleMember_21d17cf9-7458-48c6-a969-3232761fd127" xlink:href="casy-20250430.xsd#casy_FikesWholesaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_bc4d9075-cab6-46b8-83b4-f2f9dfc1bd99" xlink:to="loc_casy_FikesWholesaleMember_21d17cf9-7458-48c6-a969-3232761fd127" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_c6e30a0a-1a52-4a5f-8222-0c7f2eaa114c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_bc4d9075-cab6-46b8-83b4-f2f9dfc1bd99" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_c6e30a0a-1a52-4a5f-8222-0c7f2eaa114c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_186110c3-27d2-4035-8fc7-9189350b7f7c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_cb0dfc23-ef39-4d37-845a-1e39e2346536" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_cb0dfc23-ef39-4d37-845a-1e39e2346536" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_3bd822c6-6506-45f2-8048-a6a5b2b0a35c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_3bd822c6-6506-45f2-8048-a6a5b2b0a35c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_fd945203-8400-4138-b699-c82b784f7362" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_fd945203-8400-4138-b699-c82b784f7362" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_dee0ad3a-332b-48d7-8b7c-389fd4777fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_dee0ad3a-332b-48d7-8b7c-389fd4777fd9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_ed3d47f4-710b-410e-b95b-0a12e85dfa43" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_ed3d47f4-710b-410e-b95b-0a12e85dfa43" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_a44c012f-9ab9-4c18-9fee-30d1c1b5fd5e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_a44c012f-9ab9-4c18-9fee-30d1c1b5fd5e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseRightOfUseAsset_7ffbf165-13a7-4f81-b1ac-978b4d33202e" xlink:href="casy-20250430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseRightOfUseAsset_7ffbf165-13a7-4f81-b1ac-978b4d33202e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAsset_8c334ba4-758b-429b-8d20-ad25c16085e8" xlink:href="casy-20250430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAsset_8c334ba4-758b-429b-8d20-ad25c16085e8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_930c5ffc-0cb8-4d2a-a0d7-c97330299f4f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_930c5ffc-0cb8-4d2a-a0d7-c97330299f4f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_b671bedc-abce-419d-947f-1cee04858260" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_b671bedc-abce-419d-947f-1cee04858260" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_e1cf72fb-5b8a-4c25-916c-7a1f131c82eb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_Goodwill_e1cf72fb-5b8a-4c25-916c-7a1f131c82eb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_ba104a58-5bc5-491d-bedc-f5efd77ab6fd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_61b3d491-c92c-4a70-a3d4-c7b2a78322d2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_ba104a58-5bc5-491d-bedc-f5efd77ab6fd" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_58e6e464-c029-4d60-a9b3-4fa38c5a1543" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_186110c3-27d2-4035-8fc7-9189350b7f7c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_58e6e464-c029-4d60-a9b3-4fa38c5a1543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_c9bb8fe2-1ab1-4c30-b97a-dbcc9f7138df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_58e6e464-c029-4d60-a9b3-4fa38c5a1543" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_c9bb8fe2-1ab1-4c30-b97a-dbcc9f7138df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilitiesAndOtherNoncurrentLiabilities_0ab64530-4cd5-4339-8d4b-dd2efcccf036" xlink:href="casy-20250430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilitiesAndOtherNoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_58e6e464-c029-4d60-a9b3-4fa38c5a1543" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilitiesAndOtherNoncurrentLiabilities_0ab64530-4cd5-4339-8d4b-dd2efcccf036" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseLiability_87d01906-82f9-4422-a7f4-a61cde5aa5bd" xlink:href="casy-20250430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_58e6e464-c029-4d60-a9b3-4fa38c5a1543" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseLiability_87d01906-82f9-4422-a7f4-a61cde5aa5bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities_bb18800c-0479-41d9-a6e0-755c8f539687" xlink:href="casy-20250430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_58e6e464-c029-4d60-a9b3-4fa38c5a1543" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities_bb18800c-0479-41d9-a6e0-755c8f539687" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_5f3426b4-6016-4a70-842e-1c68c264a11f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_58e6e464-c029-4d60-a9b3-4fa38c5a1543" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_5f3426b4-6016-4a70-842e-1c68c264a11f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_aab22591-9b71-423e-949b-97374f9602dd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_186110c3-27d2-4035-8fc7-9189350b7f7c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_aab22591-9b71-423e-949b-97374f9602dd" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/AcquisitionsSummaryofUnauditedProFormaInformationDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#AcquisitionsSummaryofUnauditedProFormaInformationDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/AcquisitionsSummaryofUnauditedProFormaInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_c809c46c-0aca-46f8-b236-a5443393984a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_2e13118d-6e44-42fb-8531-450ef6a4a3a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c809c46c-0aca-46f8-b236-a5443393984a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_2e13118d-6e44-42fb-8531-450ef6a4a3a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9e0683d9-2444-49f8-a9a1-46c016bbef2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_2e13118d-6e44-42fb-8531-450ef6a4a3a0" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9e0683d9-2444-49f8-a9a1-46c016bbef2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9e0683d9-2444-49f8-a9a1-46c016bbef2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9e0683d9-2444-49f8-a9a1-46c016bbef2e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9e0683d9-2444-49f8-a9a1-46c016bbef2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c3a58535-e650-4d31-8bef-4efdf79ed3a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9e0683d9-2444-49f8-a9a1-46c016bbef2e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c3a58535-e650-4d31-8bef-4efdf79ed3a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_FikesWholesaleMember_97af28e9-1032-441d-bbb7-a0e2ce82bf7e" xlink:href="casy-20250430.xsd#casy_FikesWholesaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c3a58535-e650-4d31-8bef-4efdf79ed3a9" xlink:to="loc_casy_FikesWholesaleMember_97af28e9-1032-441d-bbb7-a0e2ce82bf7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_ee590d93-78f9-42c3-aeec-f75dc520b792" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c809c46c-0aca-46f8-b236-a5443393984a" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_ee590d93-78f9-42c3-aeec-f75dc520b792" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_15ad9b35-7c06-4d0a-868b-e52609dac599" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c809c46c-0aca-46f8-b236-a5443393984a" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_15ad9b35-7c06-4d0a-868b-e52609dac599" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_d38fd5f4-7bed-4ff9-9b32-99a103b3fc5f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c809c46c-0aca-46f8-b236-a5443393984a" xlink:to="loc_us-gaap_EarningsPerShareAbstract_d38fd5f4-7bed-4ff9-9b32-99a103b3fc5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_ac5c3961-6597-44ac-86bf-55744f2a0388" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_d38fd5f4-7bed-4ff9-9b32-99a103b3fc5f" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_ac5c3961-6597-44ac-86bf-55744f2a0388" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_572b6463-5d6b-4567-b3c2-2552ba9cb650" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_d38fd5f4-7bed-4ff9-9b32-99a103b3fc5f" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_572b6463-5d6b-4567-b3c2-2552ba9cb650" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/FairValueofFinancialInstrumentsandLongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#FairValueofFinancialInstrumentsandLongTermDebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/FairValueofFinancialInstrumentsandLongTermDebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_1b2335fe-0b1e-4285-81c4-1f552d803d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_DebtInstrumentTable_1b2335fe-0b1e-4285-81c4-1f552d803d2d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e08dc317-6b32-4733-8636-53797af43643" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1b2335fe-0b1e-4285-81c4-1f552d803d2d" xlink:to="loc_srt_RangeAxis_e08dc317-6b32-4733-8636-53797af43643" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e08dc317-6b32-4733-8636-53797af43643_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e08dc317-6b32-4733-8636-53797af43643" xlink:to="loc_srt_RangeMember_e08dc317-6b32-4733-8636-53797af43643_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_dfffe38b-414f-42f7-b679-b7cbcb208ad4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e08dc317-6b32-4733-8636-53797af43643" xlink:to="loc_srt_RangeMember_dfffe38b-414f-42f7-b679-b7cbcb208ad4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_15213212-6df5-4b49-b4ea-353b7d3774ba" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_dfffe38b-414f-42f7-b679-b7cbcb208ad4" xlink:to="loc_srt_MinimumMember_15213212-6df5-4b49-b4ea-353b7d3774ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4f0639f9-2122-408b-82f6-2994ebe1cef8" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_dfffe38b-414f-42f7-b679-b7cbcb208ad4" xlink:to="loc_srt_MaximumMember_4f0639f9-2122-408b-82f6-2994ebe1cef8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_39b2fde9-8695-4457-be5c-0f2e847dfdff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1b2335fe-0b1e-4285-81c4-1f552d803d2d" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_39b2fde9-8695-4457-be5c-0f2e847dfdff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_39b2fde9-8695-4457-be5c-0f2e847dfdff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_39b2fde9-8695-4457-be5c-0f2e847dfdff" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_39b2fde9-8695-4457-be5c-0f2e847dfdff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4a34d33c-155c-4b44-9987-625abc214b5a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_39b2fde9-8695-4457-be5c-0f2e847dfdff" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4a34d33c-155c-4b44-9987-625abc214b5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_a635e002-debe-472a-b716-e0b903b2723c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4a34d33c-155c-4b44-9987-625abc214b5a" xlink:to="loc_us-gaap_SeniorNotesMember_a635e002-debe-472a-b716-e0b903b2723c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_522285c6-78a8-4a4b-9e32-022b85a9f5a6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4a34d33c-155c-4b44-9987-625abc214b5a" xlink:to="loc_us-gaap_LineOfCreditMember_522285c6-78a8-4a4b-9e32-022b85a9f5a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_4015e977-4d61-4b1e-8e6a-f844682293d4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1b2335fe-0b1e-4285-81c4-1f552d803d2d" xlink:to="loc_us-gaap_DebtInstrumentAxis_4015e977-4d61-4b1e-8e6a-f844682293d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4015e977-4d61-4b1e-8e6a-f844682293d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_4015e977-4d61-4b1e-8e6a-f844682293d4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4015e977-4d61-4b1e-8e6a-f844682293d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_4015e977-4d61-4b1e-8e6a-f844682293d4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SeriesIAndJSeniorNotesMember_c3a949d6-d790-4ee1-83aa-c9983a15eaaf" xlink:href="casy-20250430.xsd#casy_SeriesIAndJSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_SeriesIAndJSeniorNotesMember_c3a949d6-d790-4ee1-83aa-c9983a15eaaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SeriesISeniorNotesMember_d45eaf0c-3fe2-4d65-b99c-41a267b99945" xlink:href="casy-20250430.xsd#casy_SeriesISeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_SeriesISeniorNotesMember_d45eaf0c-3fe2-4d65-b99c-41a267b99945" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SeriesJSeniorNotesMember_cdc95907-c030-4673-bda5-0f801df77fc5" xlink:href="casy-20250430.xsd#casy_SeriesJSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_SeriesJSeniorNotesMember_cdc95907-c030-4673-bda5-0f801df77fc5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_NewCreditAgreementTermLoanFacilityMember_c6a266f5-5b4b-47f9-8d55-61ad6ab03e91" xlink:href="casy-20250430.xsd#casy_NewCreditAgreementTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_NewCreditAgreementTermLoanFacilityMember_c6a266f5-5b4b-47f9-8d55-61ad6ab03e91" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_NewCreditAgreementRevolvingCreditFacilityMember_8088be90-3d3b-4705-8e5e-2f71290feca6" xlink:href="casy-20250430.xsd#casy_NewCreditAgreementRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_NewCreditAgreementRevolvingCreditFacilityMember_8088be90-3d3b-4705-8e5e-2f71290feca6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_CreditFacilitiesMember_ea844285-a131-4ae2-8f06-dcf563d67a03" xlink:href="casy-20250430.xsd#casy_CreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_CreditFacilitiesMember_ea844285-a131-4ae2-8f06-dcf563d67a03" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TermLoanFacilityMember_48c8a976-7dcb-42c5-a623-a5a19fbaf09e" xlink:href="casy-20250430.xsd#casy_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_TermLoanFacilityMember_48c8a976-7dcb-42c5-a623-a5a19fbaf09e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_IncrementalTermLoanMember_0f96ab3e-2b97-46fd-8c30-e1662276474e" xlink:href="casy-20250430.xsd#casy_IncrementalTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_IncrementalTermLoanMember_0f96ab3e-2b97-46fd-8c30-e1662276474e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BankLineMember_790aa097-b780-4f6b-9910-94fc512c30bd" xlink:href="casy-20250430.xsd#casy_BankLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_def89cfe-a017-477b-9b28-ec2e7777624c" xlink:to="loc_casy_BankLineMember_790aa097-b780-4f6b-9910-94fc512c30bd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_38119422-2206-4d39-96c7-984a92411b08" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1b2335fe-0b1e-4285-81c4-1f552d803d2d" xlink:to="loc_us-gaap_CreditFacilityAxis_38119422-2206-4d39-96c7-984a92411b08" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_38119422-2206-4d39-96c7-984a92411b08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_38119422-2206-4d39-96c7-984a92411b08" xlink:to="loc_us-gaap_CreditFacilityDomain_38119422-2206-4d39-96c7-984a92411b08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_7141a29b-d50f-4790-93be-ebc5c04bf5e6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_38119422-2206-4d39-96c7-984a92411b08" xlink:to="loc_us-gaap_CreditFacilityDomain_7141a29b-d50f-4790-93be-ebc5c04bf5e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_ff633b7e-2265-4972-9dc1-70038238499a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7141a29b-d50f-4790-93be-ebc5c04bf5e6" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_ff633b7e-2265-4972-9dc1-70038238499a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_b04f4fc0-8401-4651-a140-9ac193a63126" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7141a29b-d50f-4790-93be-ebc5c04bf5e6" xlink:to="loc_us-gaap_LineOfCreditMember_b04f4fc0-8401-4651-a140-9ac193a63126" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_7aed9680-aef1-4553-ad21-cf7acc470631" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7141a29b-d50f-4790-93be-ebc5c04bf5e6" xlink:to="loc_us-gaap_LetterOfCreditMember_7aed9680-aef1-4553-ad21-cf7acc470631" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_fdda905d-8aee-4503-8008-02561035f68e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1b2335fe-0b1e-4285-81c4-1f552d803d2d" xlink:to="loc_us-gaap_VariableRateAxis_fdda905d-8aee-4503-8008-02561035f68e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_fdda905d-8aee-4503-8008-02561035f68e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_fdda905d-8aee-4503-8008-02561035f68e" xlink:to="loc_us-gaap_VariableRateDomain_fdda905d-8aee-4503-8008-02561035f68e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_e443cc9c-86c4-45a0-92e6-30e7e4ac97a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_fdda905d-8aee-4503-8008-02561035f68e" xlink:to="loc_us-gaap_VariableRateDomain_e443cc9c-86c4-45a0-92e6-30e7e4ac97a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_9f9f2721-ad75-4854-a38f-3f07dd4a705d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_e443cc9c-86c4-45a0-92e6-30e7e4ac97a0" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_9f9f2721-ad75-4854-a38f-3f07dd4a705d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_aa4ed1ef-4013-48ba-9bd7-d0f723365dae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_e443cc9c-86c4-45a0-92e6-30e7e4ac97a0" xlink:to="loc_us-gaap_BaseRateMember_aa4ed1ef-4013-48ba-9bd7-d0f723365dae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_81ea383e-7f13-4964-9619-b75e5ad4f826" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_e443cc9c-86c4-45a0-92e6-30e7e4ac97a0" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_81ea383e-7f13-4964-9619-b75e5ad4f826" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_DailySimpleSecuredOvernightFinancingRateMember_fbbf9f89-e794-4ce1-8160-1bc3894edc9f" xlink:href="casy-20250430.xsd#casy_DailySimpleSecuredOvernightFinancingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_e443cc9c-86c4-45a0-92e6-30e7e4ac97a0" xlink:to="loc_casy_DailySimpleSecuredOvernightFinancingRateMember_fbbf9f89-e794-4ce1-8160-1bc3894edc9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_bae8f8aa-a557-4957-8e6a-dd9e98bc701c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_LongTermDebtFairValue_bae8f8aa-a557-4957-8e6a-dd9e98bc701c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_6f431c6c-aa06-4903-8afe-8334fed1b12d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_FinanceLeaseLiability_6f431c6c-aa06-4903-8afe-8334fed1b12d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList_de641acf-1ddf-437a-8aff-210bcc870ea8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList_de641acf-1ddf-437a-8aff-210bcc870ea8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_ef09be00-5359-4bc1-8d65-50ad027d26af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_ef09be00-5359-4bc1-8d65-50ad027d26af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a02d1aaf-02b3-4a15-9897-46ff5651a6ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a02d1aaf-02b3-4a15-9897-46ff5651a6ca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c8faf281-9a09-4525-970d-f53d6c854904" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c8faf281-9a09-4525-970d-f53d6c854904" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_DebtInstrumentPeriodicPaymentPercentageOfPrincipal_483fc76c-f8eb-43a4-91de-cb6551e34eaa" xlink:href="casy-20250430.xsd#casy_DebtInstrumentPeriodicPaymentPercentageOfPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_casy_DebtInstrumentPeriodicPaymentPercentageOfPrincipal_483fc76c-f8eb-43a4-91de-cb6551e34eaa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_LineOfCreditFacilityMaximumBorrowingCapacityIncrease_7de09495-066c-4b6e-8a2e-07137c52d0fe" xlink:href="casy-20250430.xsd#casy_LineOfCreditFacilityMaximumBorrowingCapacityIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_casy_LineOfCreditFacilityMaximumBorrowingCapacityIncrease_7de09495-066c-4b6e-8a2e-07137c52d0fe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_LineOfCreditMaximumIncreaseInBorrowingCapacityAsAPercentageOfConsolidatedEBITDA_5ed6171a-4297-494d-b076-8690a63cd7a4" xlink:href="casy-20250430.xsd#casy_LineOfCreditMaximumIncreaseInBorrowingCapacityAsAPercentageOfConsolidatedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_casy_LineOfCreditMaximumIncreaseInBorrowingCapacityAsAPercentageOfConsolidatedEBITDA_5ed6171a-4297-494d-b076-8690a63cd7a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_58b5fffb-27cd-4dea-8f60-94de11f4b608" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_58b5fffb-27cd-4dea-8f60-94de11f4b608" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal_940cf028-c754-4635-8824-2da4215e7f44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal_940cf028-c754-4635-8824-2da4215e7f44" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_add3f200-ee8b-4429-b5c9-e20de8b3bffe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_LongTermDebt_add3f200-ee8b-4429-b5c9-e20de8b3bffe" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a58b8e36-6906-4420-98cc-bfd800d0c4df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a58b8e36-6906-4420-98cc-bfd800d0c4df" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_743c5406-7df7-4e30-81ab-a379012e6980" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_743c5406-7df7-4e30-81ab-a379012e6980" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_ce95af3b-5e90-49b3-b21d-620ff4104621" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestCostsCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_03d317b1-aead-4278-a1e2-15cfa7095786" xlink:to="loc_us-gaap_InterestCostsCapitalized_ce95af3b-5e90-49b3-b21d-620ff4104621" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/FairValueofFinancialInstrumentsandLongTermDebtCarryingValueofLongtermDebtDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#FairValueofFinancialInstrumentsandLongTermDebtCarryingValueofLongtermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/FairValueofFinancialInstrumentsandLongTermDebtCarryingValueofLongtermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_965ef9cc-f07c-4707-b2a8-3d940ef9bc50" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_DebtInstrumentTable_965ef9cc-f07c-4707-b2a8-3d940ef9bc50" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_ea31316d-c594-4fb7-a2aa-e3169e9c1977" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_965ef9cc-f07c-4707-b2a8-3d940ef9bc50" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_ea31316d-c594-4fb7-a2aa-e3169e9c1977" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ea31316d-c594-4fb7-a2aa-e3169e9c1977_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ea31316d-c594-4fb7-a2aa-e3169e9c1977" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ea31316d-c594-4fb7-a2aa-e3169e9c1977_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3241b637-3b40-4dd1-ab03-87a2f275367f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ea31316d-c594-4fb7-a2aa-e3169e9c1977" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3241b637-3b40-4dd1-ab03-87a2f275367f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_564e66c6-6ca0-49cc-866d-05face021e74" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_3241b637-3b40-4dd1-ab03-87a2f275367f" xlink:to="loc_us-gaap_SeniorNotesMember_564e66c6-6ca0-49cc-866d-05face021e74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_02c3d47f-f48f-459c-b28f-611dffca663d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_3241b637-3b40-4dd1-ab03-87a2f275367f" xlink:to="loc_us-gaap_LineOfCreditMember_02c3d47f-f48f-459c-b28f-611dffca663d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_046fb858-9b93-43ee-ade8-240a466332d2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_965ef9cc-f07c-4707-b2a8-3d940ef9bc50" xlink:to="loc_us-gaap_DebtInstrumentAxis_046fb858-9b93-43ee-ade8-240a466332d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_046fb858-9b93-43ee-ade8-240a466332d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_046fb858-9b93-43ee-ade8-240a466332d2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_046fb858-9b93-43ee-ade8-240a466332d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_046fb858-9b93-43ee-ade8-240a466332d2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSixSevenSeniorNotesDueJune152028Member_86a8ef02-c9da-456e-8757-f2c1b5ab27d9" xlink:href="casy-20250430.xsd#casy_ThreePointSixSevenSeniorNotesDueJune152028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_ThreePointSixSevenSeniorNotesDueJune152028Member_86a8ef02-c9da-456e-8757-f2c1b5ab27d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSevenFiveSeniorNotesDueDecember182028Member_f0fad3d0-d22e-4a3c-bcc5-013e0a34a72b" xlink:href="casy-20250430.xsd#casy_ThreePointSevenFiveSeniorNotesDueDecember182028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_ThreePointSevenFiveSeniorNotesDueDecember182028Member_f0fad3d0-d22e-4a3c-bcc5-013e0a34a72b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSixFiveSeniorNotesDueMay22031Member_3b36d9a2-e1e1-4256-8a6d-5a84e684c691" xlink:href="casy-20250430.xsd#casy_ThreePointSixFiveSeniorNotesDueMay22031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_ThreePointSixFiveSeniorNotesDueMay22031Member_3b36d9a2-e1e1-4256-8a6d-5a84e684c691" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSevenTwoSeniorNotesDueTwentyThirtyOneMember_1713bd74-f198-412b-916d-89be068021cc" xlink:href="casy-20250430.xsd#casy_ThreePointSevenTwoSeniorNotesDueTwentyThirtyOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_ThreePointSevenTwoSeniorNotesDueTwentyThirtyOneMember_1713bd74-f198-412b-916d-89be068021cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointFiveOneSeniorNotesDueJune132025Member_44c8692a-807d-4692-ad3e-c228913e059f" xlink:href="casy-20250430.xsd#casy_ThreePointFiveOneSeniorNotesDueJune132025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_ThreePointFiveOneSeniorNotesDueJune132025Member_44c8692a-807d-4692-ad3e-c228913e059f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSevenSevenSeniorNotesdueAugust222028Member_9e124b62-fcf8-42a2-ad36-4fed51e31b53" xlink:href="casy-20250430.xsd#casy_ThreePointSevenSevenSeniorNotesdueAugust222028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_ThreePointSevenSevenSeniorNotesdueAugust222028Member_9e124b62-fcf8-42a2-ad36-4fed51e31b53" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TwoPointEightFiveSeniorNotesDueAugust72030Member_7fead58d-5870-4f0d-b0c2-23f62c932194" xlink:href="casy-20250430.xsd#casy_TwoPointEightFiveSeniorNotesDueAugust72030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_TwoPointEightFiveSeniorNotesDueAugust72030Member_7fead58d-5870-4f0d-b0c2-23f62c932194" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TwoPointNineSixSeniorNotesDueAugust62032Member_9397c05d-7077-4370-ae2d-7cbbadb0fb59" xlink:href="casy-20250430.xsd#casy_TwoPointNineSixSeniorNotesDueAugust62032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_TwoPointNineSixSeniorNotesDueAugust62032Member_9397c05d-7077-4370-ae2d-7cbbadb0fb59" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SeriesISeniorNotesMember_f2ff4fef-fe3e-4e6d-85a5-30f415a923c3" xlink:href="casy-20250430.xsd#casy_SeriesISeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_SeriesISeniorNotesMember_f2ff4fef-fe3e-4e6d-85a5-30f415a923c3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SeriesJSeniorNotesMember_fd0e0159-8e24-4bc4-91f6-fc0c8582650c" xlink:href="casy-20250430.xsd#casy_SeriesJSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_SeriesJSeniorNotesMember_fd0e0159-8e24-4bc4-91f6-fc0c8582650c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TermLoanFacilityMember_16100f96-7fd8-4cf1-82ab-3ebde11fcc11" xlink:href="casy-20250430.xsd#casy_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_TermLoanFacilityMember_16100f96-7fd8-4cf1-82ab-3ebde11fcc11" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_IncrementalTermLoanFacilityMember_1ac5e16e-c455-47c0-9e21-476e26e9bf1f" xlink:href="casy-20250430.xsd#casy_IncrementalTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1dd26ccb-73ee-4cb5-8b1f-84d898887196" xlink:to="loc_casy_IncrementalTermLoanFacilityMember_1ac5e16e-c455-47c0-9e21-476e26e9bf1f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_e570e66b-0d9d-4a0f-be7c-8b5382b32108" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_e570e66b-0d9d-4a0f-be7c-8b5382b32108" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_DebtInstrumentPeriodicPaymentNumberofPayments_d0421e30-66b5-4120-939f-4fd75c43861b" xlink:href="casy-20250430.xsd#casy_DebtInstrumentPeriodicPaymentNumberofPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_casy_DebtInstrumentPeriodicPaymentNumberofPayments_d0421e30-66b5-4120-939f-4fd75c43861b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_7d9e8889-7e37-476f-b91f-51c68e365af0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_FinanceLeaseLiability_7d9e8889-7e37-476f-b91f-51c68e365af0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_225c27f4-2eec-43b7-bdaf-52c44474e4b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_LongTermDebt_225c27f4-2eec-43b7-bdaf-52c44474e4b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_176f3cb6-cc1f-4eeb-a8b1-fbd49b04c93d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_176f3cb6-cc1f-4eeb-a8b1-fbd49b04c93d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_13e445ce-664f-4df2-9c4c-7952dee495d3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_13e445ce-664f-4df2-9c4c-7952dee495d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_a3144d63-a7e9-4f3a-8462-f702f288dd0c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_a3144d63-a7e9-4f3a-8462-f702f288dd0c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_af46b067-132d-4305-8b4e-f052bb3f5a14" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9d850d-2c66-47d9-97b2-72b3c213ace2" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_af46b067-132d-4305-8b4e-f052bb3f5a14" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/PreferredandCommonStockDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#PreferredandCommonStockDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/PreferredandCommonStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_711b73cb-44a2-4052-80a2-f0e362921ddc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_711b73cb-44a2-4052-80a2-f0e362921ddc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_60321105-d623-4b8c-a99a-8dd3935ffd38" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_711b73cb-44a2-4052-80a2-f0e362921ddc" xlink:to="loc_us-gaap_StatementClassOfStockAxis_60321105-d623-4b8c-a99a-8dd3935ffd38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_60321105-d623-4b8c-a99a-8dd3935ffd38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_60321105-d623-4b8c-a99a-8dd3935ffd38" xlink:to="loc_us-gaap_ClassOfStockDomain_60321105-d623-4b8c-a99a-8dd3935ffd38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_60325898-26a5-46ac-9ef7-bdedf641a42f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_60321105-d623-4b8c-a99a-8dd3935ffd38" xlink:to="loc_us-gaap_ClassOfStockDomain_60325898-26a5-46ac-9ef7-bdedf641a42f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_3c9abd9f-11f6-44b7-9791-3cdda08eea22" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_60325898-26a5-46ac-9ef7-bdedf641a42f" xlink:to="loc_us-gaap_PreferredStockMember_3c9abd9f-11f6-44b7-9791-3cdda08eea22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_96312249-9ac5-44e9-9c8b-6f866f90f4c0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_60325898-26a5-46ac-9ef7-bdedf641a42f" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_96312249-9ac5-44e9-9c8b-6f866f90f4c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_e438f4dc-1813-4193-b0dc-32865f43ed99" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_60325898-26a5-46ac-9ef7-bdedf641a42f" xlink:to="loc_us-gaap_CommonStockMember_e438f4dc-1813-4193-b0dc-32865f43ed99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_f06b8f75-5c43-4bcc-9cce-ff4252264725" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_711b73cb-44a2-4052-80a2-f0e362921ddc" xlink:to="loc_us-gaap_PlanNameAxis_f06b8f75-5c43-4bcc-9cce-ff4252264725" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_f06b8f75-5c43-4bcc-9cce-ff4252264725_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_f06b8f75-5c43-4bcc-9cce-ff4252264725" xlink:to="loc_us-gaap_PlanNameDomain_f06b8f75-5c43-4bcc-9cce-ff4252264725_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b6916159-d607-4c8e-8d42-54fb68094bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_f06b8f75-5c43-4bcc-9cce-ff4252264725" xlink:to="loc_us-gaap_PlanNameDomain_b6916159-d607-4c8e-8d42-54fb68094bfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_StockIncentivePlanMember_54f214f0-c65e-44d4-8b02-29406ff358a0" xlink:href="casy-20250430.xsd#casy_StockIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b6916159-d607-4c8e-8d42-54fb68094bfc" xlink:to="loc_casy_StockIncentivePlanMember_54f214f0-c65e-44d4-8b02-29406ff358a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_59dbec57-9f82-4736-8df6-193608374c70" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_711b73cb-44a2-4052-80a2-f0e362921ddc" xlink:to="loc_us-gaap_AwardTypeAxis_59dbec57-9f82-4736-8df6-193608374c70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_59dbec57-9f82-4736-8df6-193608374c70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_59dbec57-9f82-4736-8df6-193608374c70" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_59dbec57-9f82-4736-8df6-193608374c70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb0b0b04-0bf8-4d6f-94f7-9d83864d8e8b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_59dbec57-9f82-4736-8df6-193608374c70" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb0b0b04-0bf8-4d6f-94f7-9d83864d8e8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_e38a853c-fd43-4104-a1a3-67283bdac896" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb0b0b04-0bf8-4d6f-94f7-9d83864d8e8b" xlink:to="loc_us-gaap_EmployeeStockOptionMember_e38a853c-fd43-4104-a1a3-67283bdac896" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_3b209e42-87ec-401e-bd3a-9c479e97fb46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb0b0b04-0bf8-4d6f-94f7-9d83864d8e8b" xlink:to="loc_us-gaap_RestrictedStockMember_3b209e42-87ec-401e-bd3a-9c479e97fb46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_RestrictedStockUnitsTimeBasedMember_3f0a5a1a-6354-49ee-88df-fbe6153a285c" xlink:href="casy-20250430.xsd#casy_RestrictedStockUnitsTimeBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb0b0b04-0bf8-4d6f-94f7-9d83864d8e8b" xlink:to="loc_casy_RestrictedStockUnitsTimeBasedMember_3f0a5a1a-6354-49ee-88df-fbe6153a285c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_RestrictedStockUnitsRSUsPerformanceBasedMember_17eb744d-bcbb-491f-b582-0c72119aacfd" xlink:href="casy-20250430.xsd#casy_RestrictedStockUnitsRSUsPerformanceBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb0b0b04-0bf8-4d6f-94f7-9d83864d8e8b" xlink:to="loc_casy_RestrictedStockUnitsRSUsPerformanceBasedMember_17eb744d-bcbb-491f-b582-0c72119aacfd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_215d22b2-e17e-42e0-8f05-d6b01dfda3bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb0b0b04-0bf8-4d6f-94f7-9d83864d8e8b" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_215d22b2-e17e-42e0-8f05-d6b01dfda3bf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c75ae8a1-06aa-4b75-a566-a39767932f8d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_711b73cb-44a2-4052-80a2-f0e362921ddc" xlink:to="loc_srt_RangeAxis_c75ae8a1-06aa-4b75-a566-a39767932f8d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c75ae8a1-06aa-4b75-a566-a39767932f8d_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c75ae8a1-06aa-4b75-a566-a39767932f8d" xlink:to="loc_srt_RangeMember_c75ae8a1-06aa-4b75-a566-a39767932f8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_efed97d0-cd88-4208-96aa-bcd08624c06b" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c75ae8a1-06aa-4b75-a566-a39767932f8d" xlink:to="loc_srt_RangeMember_efed97d0-cd88-4208-96aa-bcd08624c06b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a6df9970-7f65-4797-87e4-ae77f9db8510" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_efed97d0-cd88-4208-96aa-bcd08624c06b" xlink:to="loc_srt_MinimumMember_a6df9970-7f65-4797-87e4-ae77f9db8510" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1d6b321e-f006-4562-82d2-e06b978d5091" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_efed97d0-cd88-4208-96aa-bcd08624c06b" xlink:to="loc_srt_MaximumMember_1d6b321e-f006-4562-82d2-e06b978d5091" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_1557b1fe-ff69-4b34-bcfc-78c1e2195556" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_1557b1fe-ff69-4b34-bcfc-78c1e2195556" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_c5177dcc-b366-48d7-a49b-e1e001563345" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_PreferredStockSharesIssued_c5177dcc-b366-48d7-a49b-e1e001563345" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_2c8c2e4b-b8e2-4b0c-8f1a-7fc7bb38c52b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_2c8c2e4b-b8e2-4b0c-8f1a-7fc7bb38c52b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerStockOptionIssued_40d19828-feb9-4d45-89e2-1c33eda4fc83" xlink:href="casy-20250430.xsd#casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerStockOptionIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerStockOptionIssued_40d19828-feb9-4d45-89e2-1c33eda4fc83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerEquityInstrumentsOtherOptionsIssued_c960364b-b19b-4917-959b-3e5cbe245e7d" xlink:href="casy-20250430.xsd#casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerEquityInstrumentsOtherOptionsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerEquityInstrumentsOtherOptionsIssued_c960364b-b19b-4917-959b-3e5cbe245e7d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_975da9c2-0251-4183-a069-d3a189a0482c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_975da9c2-0251-4183-a069-d3a189a0482c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_ed2c3395-b7cf-438b-a46d-bd6745183a95" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_ed2c3395-b7cf-438b-a46d-bd6745183a95" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_d6db4c4d-3669-4261-87d4-1a4294aa0193" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_d6db4c4d-3669-4261-87d4-1a4294aa0193" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_68fff05a-6f3d-4bc4-bead-2534bcb5b9a2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_68fff05a-6f3d-4bc4-bead-2534bcb5b9a2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_4c59ae7f-4d90-44ee-bab8-8fb4129de412" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_4c59ae7f-4d90-44ee-bab8-8fb4129de412" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_4ea2adca-06ad-420b-8c09-2908171c5c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_4ea2adca-06ad-420b-8c09-2908171c5c1d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_46e77d01-3579-453b-9786-6eb8ac735942" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_46e77d01-3579-453b-9786-6eb8ac735942" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_c62ad902-1252-4a7a-9887-e61d94e5bc39" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_c62ad902-1252-4a7a-9887-e61d94e5bc39" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_9957a7af-83ea-4d17-abe3-37150c890cd0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_58acc5c1-75fe-416e-9cf8-6b7afdb6312c" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_9957a7af-83ea-4d17-abe3-37150c890cd0" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/PreferredandCommonStockScheduleofRestrictedStockUnitsAwardActivityDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#PreferredandCommonStockScheduleofRestrictedStockUnitsAwardActivityDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/PreferredandCommonStockScheduleofRestrictedStockUnitsAwardActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ab1ea1e2-f077-45a4-bee8-b334d9f48c35" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f7f9114d-cd3c-4a30-b32a-3d5ace29f8e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ab1ea1e2-f077-45a4-bee8-b334d9f48c35" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f7f9114d-cd3c-4a30-b32a-3d5ace29f8e9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_85ae198b-d43e-4173-8117-ce7ec2db4b82" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f7f9114d-cd3c-4a30-b32a-3d5ace29f8e9" xlink:to="loc_us-gaap_AwardTypeAxis_85ae198b-d43e-4173-8117-ce7ec2db4b82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_85ae198b-d43e-4173-8117-ce7ec2db4b82_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_85ae198b-d43e-4173-8117-ce7ec2db4b82" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_85ae198b-d43e-4173-8117-ce7ec2db4b82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_dd2d51bc-aa22-42c7-9652-74f28b61be17" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_85ae198b-d43e-4173-8117-ce7ec2db4b82" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_dd2d51bc-aa22-42c7-9652-74f28b61be17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_84ee90fa-a159-4410-a43b-95a19263e397" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_dd2d51bc-aa22-42c7-9652-74f28b61be17" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_84ee90fa-a159-4410-a43b-95a19263e397" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_43b31912-8ff0-4b37-9397-a4d2599192cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ab1ea1e2-f077-45a4-bee8-b334d9f48c35" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_43b31912-8ff0-4b37-9397-a4d2599192cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e54ffaf3-2fb9-4185-8fff-f279c6536abb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_43b31912-8ff0-4b37-9397-a4d2599192cf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e54ffaf3-2fb9-4185-8fff-f279c6536abb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3f27cd15-eead-4599-bd0a-ab05b5b833c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_43b31912-8ff0-4b37-9397-a4d2599192cf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3f27cd15-eead-4599-bd0a-ab05b5b833c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_5868bb4a-eab8-49b5-9890-0d31d65268a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_43b31912-8ff0-4b37-9397-a4d2599192cf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_5868bb4a-eab8-49b5-9890-0d31d65268a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_07f99478-4b83-4cd3-ba8f-eb3105b1a84b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_43b31912-8ff0-4b37-9397-a4d2599192cf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_07f99478-4b83-4cd3-ba8f-eb3105b1a84b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriod_7a810396-fbd8-4853-89c5-f5e633022372" xlink:href="casy-20250430.xsd#casy_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_43b31912-8ff0-4b37-9397-a4d2599192cf" xlink:to="loc_casy_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriod_7a810396-fbd8-4853-89c5-f5e633022372" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_c3fd8b75-8d81-4b72-a0a3-317540767017" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_67e7d5a1-59fe-4aba-874d-cf67fc2e1671" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ab1ea1e2-f077-45a4-bee8-b334d9f48c35" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_67e7d5a1-59fe-4aba-874d-cf67fc2e1671" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_5c8c5c36-8b85-490a-bdbc-8f4898a055cb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_67e7d5a1-59fe-4aba-874d-cf67fc2e1671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_5c8c5c36-8b85-490a-bdbc-8f4898a055cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_24413104-59fa-4785-aa91-ff6cfac35f48" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_67e7d5a1-59fe-4aba-874d-cf67fc2e1671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_24413104-59fa-4785-aa91-ff6cfac35f48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_abd2a02e-55dd-4f7b-81a0-a7a369295ac0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_67e7d5a1-59fe-4aba-874d-cf67fc2e1671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_abd2a02e-55dd-4f7b-81a0-a7a369295ac0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_8c059627-13c2-4554-a0ea-8d6d108d6473" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_67e7d5a1-59fe-4aba-874d-cf67fc2e1671" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_8c059627-13c2-4554-a0ea-8d6d108d6473" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriodWeightedAverageGrantDateFairValue_e18779d2-5ba3-46de-8be0-1fa107c556cf" xlink:href="casy-20250430.xsd#casy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_67e7d5a1-59fe-4aba-874d-cf67fc2e1671" xlink:to="loc_casy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriodWeightedAverageGrantDateFairValue_e18779d2-5ba3-46de-8be0-1fa107c556cf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_def56f62-ce4f-4458-9c6e-3126dd573cd5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_3ab99c95-5e8c-4873-8ca5-393870f71e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_3ab99c95-5e8c-4873-8ca5-393870f71e9b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_f71af0c1-7bb8-4ca6-8411-e24d87821e90" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_3ab99c95-5e8c-4873-8ca5-393870f71e9b" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_f71af0c1-7bb8-4ca6-8411-e24d87821e90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_f71af0c1-7bb8-4ca6-8411-e24d87821e90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_f71af0c1-7bb8-4ca6-8411-e24d87821e90" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_f71af0c1-7bb8-4ca6-8411-e24d87821e90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_5c709c56-2c3e-48d5-bb50-db52770706bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_f71af0c1-7bb8-4ca6-8411-e24d87821e90" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_5c709c56-2c3e-48d5-bb50-db52770706bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_51cea635-8b73-4f2e-96dd-b7801d1ab2b7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_5c709c56-2c3e-48d5-bb50-db52770706bf" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_51cea635-8b73-4f2e-96dd-b7801d1ab2b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_761237cc-37c8-49cf-9f88-11a2e710b7fd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_OperatingLossCarryforwards_761237cc-37c8-49cf-9f88-11a2e710b7fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_623bff3f-ae09-4532-af96-6e053a3214f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_623bff3f-ae09-4532-af96-6e053a3214f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_6c3cfb3b-f5b6-4c26-84ff-c3b97b50f9e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_6c3cfb3b-f5b6-4c26-84ff-c3b97b50f9e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_6ffe767e-f7a9-4c4b-b2c4-c00f6b1a2233" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_6ffe767e-f7a9-4c4b-b2c4-c00f6b1a2233" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_9c6ae91f-7367-411c-a5b8-70121579ea62" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_9c6ae91f-7367-411c-a5b8-70121579ea62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_0889cb74-a11c-45d0-ba7f-9e60f726e170" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_0889cb74-a11c-45d0-ba7f-9e60f726e170" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_548722d8-609f-4590-91e9-f87dce55fa2d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_548722d8-609f-4590-91e9-f87dce55fa2d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_fcf3bbb4-e35b-4395-8db3-f85ff65ba782" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_fcf3bbb4-e35b-4395-8db3-f85ff65ba782" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_81be2986-f84d-4b05-949a-20771c371fc0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_53997aec-aae5-4636-9598-6c13809e693f" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_81be2986-f84d-4b05-949a-20771c371fc0" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_2b33812f-0180-40ed-8c50-7d02fe6ad152" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_6262b8f2-6d86-4ed9-9cf5-b8ee7e163909" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_2b33812f-0180-40ed-8c50-7d02fe6ad152" xlink:to="loc_us-gaap_OtherCommitmentsTable_6262b8f2-6d86-4ed9-9cf5-b8ee7e163909" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_d68deb10-6470-4b9f-bb4f-77a68b7a45e4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_6262b8f2-6d86-4ed9-9cf5-b8ee7e163909" xlink:to="loc_srt_CounterpartyNameAxis_d68deb10-6470-4b9f-bb4f-77a68b7a45e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d68deb10-6470-4b9f-bb4f-77a68b7a45e4_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_d68deb10-6470-4b9f-bb4f-77a68b7a45e4" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d68deb10-6470-4b9f-bb4f-77a68b7a45e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3e0cb9fd-949b-40a2-833f-d5a87b55c00b" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_d68deb10-6470-4b9f-bb4f-77a68b7a45e4" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3e0cb9fd-949b-40a2-833f-d5a87b55c00b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_CityOfJoplinMissouriMember_195c3896-675b-46e6-a98d-ab7791844b03" xlink:href="casy-20250430.xsd#casy_CityOfJoplinMissouriMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3e0cb9fd-949b-40a2-833f-d5a87b55c00b" xlink:to="loc_casy_CityOfJoplinMissouriMember_195c3896-675b-46e6-a98d-ab7791844b03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SaleLeasebackTransactionMaximumTaxableExemptBondsAvailable_0b4387b4-0808-49aa-96f6-53ad8c141d50" xlink:href="casy-20250430.xsd#casy_SaleLeasebackTransactionMaximumTaxableExemptBondsAvailable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_2b33812f-0180-40ed-8c50-7d02fe6ad152" xlink:to="loc_casy_SaleLeasebackTransactionMaximumTaxableExemptBondsAvailable_0b4387b4-0808-49aa-96f6-53ad8c141d50" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/BenefitPlansDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#BenefitPlansDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/BenefitPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_431520fd-9c48-4335-841e-464a08729e61" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_aa93d269-923f-4bb0-bd22-5401e6036c39" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_431520fd-9c48-4335-841e-464a08729e61" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_aa93d269-923f-4bb0-bd22-5401e6036c39" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_96b5212e-9514-4668-abcd-157cc835a286" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_aa93d269-923f-4bb0-bd22-5401e6036c39" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_96b5212e-9514-4668-abcd-157cc835a286" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_96b5212e-9514-4668-abcd-157cc835a286_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_96b5212e-9514-4668-abcd-157cc835a286" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_96b5212e-9514-4668-abcd-157cc835a286_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_f220cd0e-26d4-48fc-b74f-bdc94ca27775" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_96b5212e-9514-4668-abcd-157cc835a286" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_f220cd0e-26d4-48fc-b74f-bdc94ca27775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_04fa6a71-720c-4f9d-884e-23304d2283b2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_f220cd0e-26d4-48fc-b74f-bdc94ca27775" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_04fa6a71-720c-4f9d-884e-23304d2283b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_44d5c5b2-7f73-404d-8659-b7ea3588b54c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_431520fd-9c48-4335-841e-464a08729e61" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_44d5c5b2-7f73-404d-8659-b7ea3588b54c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_a55a346c-9861-4f3a-a337-c645f46aea78" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_431520fd-9c48-4335-841e-464a08729e61" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_a55a346c-9861-4f3a-a337-c645f46aea78" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/ContingenciesDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#ContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/ContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_a8055ede-5a9b-481f-b9e5-83bc6945553a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_fcd360e7-07b3-433f-b369-cf412301f8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_a8055ede-5a9b-481f-b9e5-83bc6945553a" xlink:to="loc_us-gaap_LossContingenciesTable_fcd360e7-07b3-433f-b369-cf412301f8b3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_cb611c45-fbe2-40bc-9b29-ed1deedd7a22" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fcd360e7-07b3-433f-b369-cf412301f8b3" xlink:to="loc_srt_ProductOrServiceAxis_cb611c45-fbe2-40bc-9b29-ed1deedd7a22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_cb611c45-fbe2-40bc-9b29-ed1deedd7a22_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_cb611c45-fbe2-40bc-9b29-ed1deedd7a22" xlink:to="loc_srt_ProductsAndServicesDomain_cb611c45-fbe2-40bc-9b29-ed1deedd7a22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e92a3ae9-5dcf-4195-bae8-743f0011048b" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_cb611c45-fbe2-40bc-9b29-ed1deedd7a22" xlink:to="loc_srt_ProductsAndServicesDomain_e92a3ae9-5dcf-4195-bae8-743f0011048b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_GeneralLiabilityAndAutoLiabilityInsuranceMember_beb4317e-1538-4ccd-8b0c-90d678f1daa8" xlink:href="casy-20250430.xsd#casy_GeneralLiabilityAndAutoLiabilityInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e92a3ae9-5dcf-4195-bae8-743f0011048b" xlink:to="loc_casy_GeneralLiabilityAndAutoLiabilityInsuranceMember_beb4317e-1538-4ccd-8b0c-90d678f1daa8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WorkersCompensationInsuranceMember_5a6ea887-76fe-43ab-b232-3b372b19bbfa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WorkersCompensationInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e92a3ae9-5dcf-4195-bae8-743f0011048b" xlink:to="loc_us-gaap_WorkersCompensationInsuranceMember_5a6ea887-76fe-43ab-b232-3b372b19bbfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_2208308c-283c-448f-8cd0-0f7ed7767e3a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fcd360e7-07b3-433f-b369-cf412301f8b3" xlink:to="loc_us-gaap_LitigationStatusAxis_2208308c-283c-448f-8cd0-0f7ed7767e3a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_2208308c-283c-448f-8cd0-0f7ed7767e3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_2208308c-283c-448f-8cd0-0f7ed7767e3a" xlink:to="loc_us-gaap_LitigationStatusDomain_2208308c-283c-448f-8cd0-0f7ed7767e3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_4af7bf4b-9a4d-478a-8e0f-eedd56d2f4ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_2208308c-283c-448f-8cd0-0f7ed7767e3a" xlink:to="loc_us-gaap_LitigationStatusDomain_4af7bf4b-9a4d-478a-8e0f-eedd56d2f4ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_490a059a-315a-4fe1-ae68-28053362cca7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PendingLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_4af7bf4b-9a4d-478a-8e0f-eedd56d2f4ad" xlink:to="loc_us-gaap_PendingLitigationMember_490a059a-315a-4fe1-ae68-28053362cca7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_29765e17-125b-4057-bbbb-6c4e997b78bf" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fcd360e7-07b3-433f-b369-cf412301f8b3" xlink:to="loc_srt_LitigationCaseAxis_29765e17-125b-4057-bbbb-6c4e997b78bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_29765e17-125b-4057-bbbb-6c4e997b78bf_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_29765e17-125b-4057-bbbb-6c4e997b78bf" xlink:to="loc_srt_LitigationCaseTypeDomain_29765e17-125b-4057-bbbb-6c4e997b78bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_1feef656-c004-47b0-bf78-6708c6ba39c6" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_29765e17-125b-4057-bbbb-6c4e997b78bf" xlink:to="loc_srt_LitigationCaseTypeDomain_1feef656-c004-47b0-bf78-6708c6ba39c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_McColleyVCaseysGeneralStoresIncMember_4fab2943-a10b-496b-90a8-cd7100a12af4" xlink:href="casy-20250430.xsd#casy_McColleyVCaseysGeneralStoresIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_1feef656-c004-47b0-bf78-6708c6ba39c6" xlink:to="loc_casy_McColleyVCaseysGeneralStoresIncMember_4fab2943-a10b-496b-90a8-cd7100a12af4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfPlaintiffs_435df8ab-f61f-43fd-baad-3af202cf036a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingencyNumberOfPlaintiffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_a8055ede-5a9b-481f-b9e5-83bc6945553a" xlink:to="loc_us-gaap_LossContingencyNumberOfPlaintiffs_435df8ab-f61f-43fd-baad-3af202cf036a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_AnnualStopLossLimit_b24e91f2-96d5-4119-aeb7-ac8dfd6c9271" xlink:href="casy-20250430.xsd#casy_AnnualStopLossLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_a8055ede-5a9b-481f-b9e5-83bc6945553a" xlink:to="loc_casy_AnnualStopLossLimit_b24e91f2-96d5-4119-aeb7-ac8dfd6c9271" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserve_ab37399c-23e2-4c25-8bd7-49ab7065344e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SelfInsuranceReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_a8055ede-5a9b-481f-b9e5-83bc6945553a" xlink:to="loc_us-gaap_SelfInsuranceReserve_ab37399c-23e2-4c25-8bd7-49ab7065344e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SegmentReportingSegmentInformationDetails" xlink:type="simple" xlink:href="casy-20250430.xsd#SegmentReportingSegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.caseys.com/role/SegmentReportingSegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_904f5cba-4d7f-43d1-871a-bd333146a9e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_904f5cba-4d7f-43d1-871a-bd333146a9e1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_05243ffd-5714-4e99-b804-223e48bcc29d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_904f5cba-4d7f-43d1-871a-bd333146a9e1" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_05243ffd-5714-4e99-b804-223e48bcc29d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_05243ffd-5714-4e99-b804-223e48bcc29d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_05243ffd-5714-4e99-b804-223e48bcc29d" xlink:to="loc_us-gaap_SegmentDomain_05243ffd-5714-4e99-b804-223e48bcc29d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_20d3eec9-6de4-4c35-8dab-c2fa9ab7a13c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_05243ffd-5714-4e99-b804-223e48bcc29d" xlink:to="loc_us-gaap_SegmentDomain_20d3eec9-6de4-4c35-8dab-c2fa9ab7a13c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ReportableSegmentMember_27f49c8d-8b6a-47e6-9f49-afec4d25352b" xlink:href="casy-20250430.xsd#casy_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_20d3eec9-6de4-4c35-8dab-c2fa9ab7a13c" xlink:to="loc_casy_ReportableSegmentMember_27f49c8d-8b6a-47e6-9f49-afec4d25352b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_8be60ce5-2201-4257-9743-3d3dca75c5c4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_904f5cba-4d7f-43d1-871a-bd333146a9e1" xlink:to="loc_srt_ProductOrServiceAxis_8be60ce5-2201-4257-9743-3d3dca75c5c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_8be60ce5-2201-4257-9743-3d3dca75c5c4_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_8be60ce5-2201-4257-9743-3d3dca75c5c4" xlink:to="loc_srt_ProductsAndServicesDomain_8be60ce5-2201-4257-9743-3d3dca75c5c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_322e180b-4b7d-4b01-8601-e2c8d61129c3" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_8be60ce5-2201-4257-9743-3d3dca75c5c4" xlink:to="loc_srt_ProductsAndServicesDomain_322e180b-4b7d-4b01-8601-e2c8d61129c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FoodAndBeverageMember_b3163030-b741-4c89-8204-0d585ac29be6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FoodAndBeverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_322e180b-4b7d-4b01-8601-e2c8d61129c3" xlink:to="loc_us-gaap_FoodAndBeverageMember_b3163030-b741-4c89-8204-0d585ac29be6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_GroceryAndGeneralMerchandiseMember_dc37476d-d1d8-4fc7-90ec-2e9a8047c58a" xlink:href="casy-20250430.xsd#casy_GroceryAndGeneralMerchandiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_322e180b-4b7d-4b01-8601-e2c8d61129c3" xlink:to="loc_casy_GroceryAndGeneralMerchandiseMember_dc37476d-d1d8-4fc7-90ec-2e9a8047c58a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FuelMember_14ea717a-5401-42e5-a180-888d07d2df6d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_FuelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_322e180b-4b7d-4b01-8601-e2c8d61129c3" xlink:to="loc_srt_FuelMember_14ea717a-5401-42e5-a180-888d07d2df6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_4a5640e1-ee01-463d-95f8-28ad5b274768" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_322e180b-4b7d-4b01-8601-e2c8d61129c3" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_4a5640e1-ee01-463d-95f8-28ad5b274768" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_b04aeee4-2711-4a26-b937-2d6ff2dd2ee5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_Revenues_b04aeee4-2711-4a26-b937-2d6ff2dd2ee5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_157d167e-b6d7-4aaf-ad43-d52db6bca1e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_157d167e-b6d7-4aaf-ad43-d52db6bca1e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_598a3b0a-efce-4b36-af8c-ecad0363ac20" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_LaborAndRelatedExpense_598a3b0a-efce-4b36-af8c-ecad0363ac20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SameStoreOtherExpenses_425d7479-298a-4971-ba2a-e5f600068278" xlink:href="casy-20250430.xsd#casy_SameStoreOtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_casy_SameStoreOtherExpenses_425d7479-298a-4971-ba2a-e5f600068278" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_CreditCardFeeExpense_88becde0-26ff-4fc4-93fb-39c7e98093b9" xlink:href="casy-20250430.xsd#casy_CreditCardFeeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_casy_CreditCardFeeExpense_88becde0-26ff-4fc4-93fb-39c7e98093b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_NonSameStoreOperatingExpense_3ecd4de0-c820-4137-a1b7-6e68ce4b74b1" xlink:href="casy-20250430.xsd#casy_NonSameStoreOperatingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_casy_NonSameStoreOperatingExpense_3ecd4de0-c820-4137-a1b7-6e68ce4b74b1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_ad23af9f-b176-43f5-b9ac-a69eef4ad595" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_ad23af9f-b176-43f5-b9ac-a69eef4ad595" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_c0db336b-57db-4d1e-bd32-cb0a44ba81c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_OperatingExpenses_c0db336b-57db-4d1e-bd32-cb0a44ba81c3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_63cd87ee-e1b0-43d0-a8ce-f80f951d4025" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_63cd87ee-e1b0-43d0-a8ce-f80f951d4025" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_f55fe50f-ac88-4dbe-97b9-66c2d0b06b7d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_InterestExpense_f55fe50f-ac88-4dbe-97b9-66c2d0b06b7d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossAttributableToParent_80752ae1-d239-47d5-8b03-eb445efac405" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_IncomeLossAttributableToParent_80752ae1-d239-47d5-8b03-eb445efac405" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b5b36b9f-3543-4627-9190-b3267b73669a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_b5b36b9f-3543-4627-9190-b3267b73669a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_46d3b34a-95f5-4b3c-be90-27caeee74ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8832fe38-0654-49f7-897c-107c9902f5c5" xlink:to="loc_us-gaap_NetIncomeLoss_46d3b34a-95f5-4b3c-be90-27caeee74ffd" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-roles-2024.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_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_LongTermDebtNoncurrent" xlink:type="arc" order="31"/>
  </link:definitionLink>
</link:linkbase>
