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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:acd4a651-fe3b-4120-865d-14f881455e35,g:b561060c-d460-426e-8700-8000043adb26-->
<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-20240430.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_0fb0021e-02d8-40e8-a46d-7d363d79c567" 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_148dea4c-4bc8-4cb3-8f74-e39451d48e75" 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_0fb0021e-02d8-40e8-a46d-7d363d79c567" xlink:to="loc_us-gaap_StatementTable_148dea4c-4bc8-4cb3-8f74-e39451d48e75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_abca2b3c-6ffa-4b9b-8c15-5421a3eb859c" 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_148dea4c-4bc8-4cb3-8f74-e39451d48e75" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_abca2b3c-6ffa-4b9b-8c15-5421a3eb859c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_abca2b3c-6ffa-4b9b-8c15-5421a3eb859c_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_abca2b3c-6ffa-4b9b-8c15-5421a3eb859c" xlink:to="loc_us-gaap_EquityComponentDomain_abca2b3c-6ffa-4b9b-8c15-5421a3eb859c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2dab60f0-87c8-438d-9fc1-ee5de9a17c7b" 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_abca2b3c-6ffa-4b9b-8c15-5421a3eb859c" xlink:to="loc_us-gaap_EquityComponentDomain_2dab60f0-87c8-438d-9fc1-ee5de9a17c7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_93a68f17-2f58-4e75-966b-032b6d4ae2c7" 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_2dab60f0-87c8-438d-9fc1-ee5de9a17c7b" xlink:to="loc_us-gaap_CommonStockMember_93a68f17-2f58-4e75-966b-032b6d4ae2c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_1144062b-d4bb-48f4-abe6-18838f3a988e" 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_2dab60f0-87c8-438d-9fc1-ee5de9a17c7b" xlink:to="loc_us-gaap_RetainedEarningsMember_1144062b-d4bb-48f4-abe6-18838f3a988e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed4e875e-b32d-4aa4-976d-7be117e2d373" 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_0fb0021e-02d8-40e8-a46d-7d363d79c567" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_d89122a1-6423-4697-b057-acba8e2aa2e5" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_d89122a1-6423-4697-b057-acba8e2aa2e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1c70efed-a7aa-4a07-ad5e-ab346286b3d2" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_StockholdersEquity_1c70efed-a7aa-4a07-ad5e-ab346286b3d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_60526b49-bca3-4cfe-a7ce-048c4df629c5" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_NetIncomeLoss_60526b49-bca3-4cfe-a7ce-048c4df629c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_987cb4f3-5917-4bff-82c5-dffe12a811fa" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_DividendsCommonStock_987cb4f3-5917-4bff-82c5-dffe12a811fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_ecc869f9-1ab9-4546-925b-991e1a0d6c86" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_ecc869f9-1ab9-4546-925b-991e1a0d6c86" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_7b18caa6-6eae-4f17-99aa-53663e3c56a7" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_7b18caa6-6eae-4f17-99aa-53663e3c56a7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_8f965dc7-235a-4f6c-8191-b3a815a90e87" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_8f965dc7-235a-4f6c-8191-b3a815a90e87" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_f3d8a893-dc3c-43f3-813b-ace28af85143" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_f3d8a893-dc3c-43f3-813b-ace28af85143" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_674109f8-7c48-4598-9bd7-97a6b3872937" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_674109f8-7c48-4598-9bd7-97a6b3872937" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_07ea411d-c859-4200-b008-f283360e5efb" 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_ed4e875e-b32d-4aa4-976d-7be117e2d373" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_07ea411d-c859-4200-b008-f283360e5efb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_be2089ad-4489-4a8e-9002-b367e4600d16" 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_45f9a425-4b8f-41aa-9628-50d0f71fa677" 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-20240430.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_8f9679ba-9d4a-4dce-bd18-ed90a2d2d4a3" 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_5f6700d7-fc58-40ca-b30e-4df904cf0ee7" 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_8f9679ba-9d4a-4dce-bd18-ed90a2d2d4a3" xlink:to="loc_us-gaap_StatementTable_5f6700d7-fc58-40ca-b30e-4df904cf0ee7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_8ff55377-873e-4084-a53c-73da966478b8" 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_5f6700d7-fc58-40ca-b30e-4df904cf0ee7" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_8ff55377-873e-4084-a53c-73da966478b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8ff55377-873e-4084-a53c-73da966478b8_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_8ff55377-873e-4084-a53c-73da966478b8" xlink:to="loc_us-gaap_EquityComponentDomain_8ff55377-873e-4084-a53c-73da966478b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f8e45ca2-7de4-4295-a4be-1cda65dc74b3" 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_8ff55377-873e-4084-a53c-73da966478b8" xlink:to="loc_us-gaap_EquityComponentDomain_f8e45ca2-7de4-4295-a4be-1cda65dc74b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_66303ea1-8751-4119-b568-627bca1c161c" 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_f8e45ca2-7de4-4295-a4be-1cda65dc74b3" xlink:to="loc_us-gaap_RetainedEarningsMember_66303ea1-8751-4119-b568-627bca1c161c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_b66aa8ee-1e3f-448f-af96-9b9fb92cdca2" 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_8f9679ba-9d4a-4dce-bd18-ed90a2d2d4a3" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_b66aa8ee-1e3f-448f-af96-9b9fb92cdca2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="casy-20240430.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_bc814047-d033-493e-b740-3c741449fafc" 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_14ed883b-fd72-4e02-97a6-554610cc46d3" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_ConcentrationRiskTable_14ed883b-fd72-4e02-97a6-554610cc46d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_582051d3-eafb-41bb-9aff-93522c4afc27" 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_14ed883b-fd72-4e02-97a6-554610cc46d3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_582051d3-eafb-41bb-9aff-93522c4afc27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_582051d3-eafb-41bb-9aff-93522c4afc27_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_582051d3-eafb-41bb-9aff-93522c4afc27" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_582051d3-eafb-41bb-9aff-93522c4afc27_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e2cd95a-393e-421e-ab90-c3ca7bbf99f0" 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_582051d3-eafb-41bb-9aff-93522c4afc27" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e2cd95a-393e-421e-ab90-c3ca7bbf99f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_52042b9f-5bde-4bd1-8b46-f3d057d63680" 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_9e2cd95a-393e-421e-ab90-c3ca7bbf99f0" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_52042b9f-5bde-4bd1-8b46-f3d057d63680" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_03cd1262-2425-4c75-ae74-bedd86b6cd59" 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_9e2cd95a-393e-421e-ab90-c3ca7bbf99f0" xlink:to="loc_us-gaap_CustomerRelationshipsMember_03cd1262-2425-4c75-ae74-bedd86b6cd59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0c8baf76-2535-4f87-a742-8d42af826808" 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_14ed883b-fd72-4e02-97a6-554610cc46d3" xlink:to="loc_srt_RangeAxis_0c8baf76-2535-4f87-a742-8d42af826808" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0c8baf76-2535-4f87-a742-8d42af826808_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_0c8baf76-2535-4f87-a742-8d42af826808" xlink:to="loc_srt_RangeMember_0c8baf76-2535-4f87-a742-8d42af826808_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_20745fd7-0450-4759-84a1-b2ac14f70ad2" 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_0c8baf76-2535-4f87-a742-8d42af826808" xlink:to="loc_srt_RangeMember_20745fd7-0450-4759-84a1-b2ac14f70ad2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9bc308a0-b9f9-4439-b8e4-5acca5a2e063" 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_20745fd7-0450-4759-84a1-b2ac14f70ad2" xlink:to="loc_srt_MinimumMember_9bc308a0-b9f9-4439-b8e4-5acca5a2e063" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_de9c1d4c-25bf-44c8-81b8-90cf0caf7af3" 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_20745fd7-0450-4759-84a1-b2ac14f70ad2" xlink:to="loc_srt_MaximumMember_de9c1d4c-25bf-44c8-81b8-90cf0caf7af3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_60cc5747-b467-4819-ad12-56cf1e5f2ab0" 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_ConcentrationRiskTable_14ed883b-fd72-4e02-97a6-554610cc46d3" xlink:to="loc_srt_ProductOrServiceAxis_60cc5747-b467-4819-ad12-56cf1e5f2ab0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_60cc5747-b467-4819-ad12-56cf1e5f2ab0_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_60cc5747-b467-4819-ad12-56cf1e5f2ab0" xlink:to="loc_srt_ProductsAndServicesDomain_60cc5747-b467-4819-ad12-56cf1e5f2ab0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c1abaf0c-f308-40eb-b62f-cf3d02f8b1e5" 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_60cc5747-b467-4819-ad12-56cf1e5f2ab0" xlink:to="loc_srt_ProductsAndServicesDomain_c1abaf0c-f308-40eb-b62f-cf3d02f8b1e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_GasolineMember_c2733bd0-b861-4ab7-952d-9fe6a4d46db0" xlink:href="casy-20240430.xsd#casy_GasolineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c1abaf0c-f308-40eb-b62f-cf3d02f8b1e5" xlink:to="loc_casy_GasolineMember_c2733bd0-b861-4ab7-952d-9fe6a4d46db0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_GiftCardsMember_a1bc07d7-4c33-4aa7-b3b3-31959a0e0d2e" xlink:href="casy-20240430.xsd#casy_GiftCardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c1abaf0c-f308-40eb-b62f-cf3d02f8b1e5" xlink:to="loc_casy_GiftCardsMember_a1bc07d7-4c33-4aa7-b3b3-31959a0e0d2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8595092a-4088-494e-a3fc-7197719bd083" 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_ConcentrationRiskTable_14ed883b-fd72-4e02-97a6-554610cc46d3" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8595092a-4088-494e-a3fc-7197719bd083" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8595092a-4088-494e-a3fc-7197719bd083_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_8595092a-4088-494e-a3fc-7197719bd083" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8595092a-4088-494e-a3fc-7197719bd083_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f8e61264-7c0e-4457-926e-79693ba5dbba" 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_8595092a-4088-494e-a3fc-7197719bd083" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f8e61264-7c0e-4457-926e-79693ba5dbba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BuchananEnergyMember_706b6b66-ae19-4a5e-9687-5dbc4f0e4bd8" xlink:href="casy-20240430.xsd#casy_BuchananEnergyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f8e61264-7c0e-4457-926e-79693ba5dbba" xlink:to="loc_casy_BuchananEnergyMember_706b6b66-ae19-4a5e-9687-5dbc4f0e4bd8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue_cc783413-9e44-45bc-b760-2072ee72b274" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue_cc783413-9e44-45bc-b760-2072ee72b274" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_44915200-a43e-4793-9a87-a01e417189eb" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_44915200-a43e-4793-9a87-a01e417189eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2d34653e-1c8f-4049-af82-b348e7013e68" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2d34653e-1c8f-4049-af82-b348e7013e68" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_b386783f-1c2f-4669-a9b4-e7e58049d417" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_b386783f-1c2f-4669-a9b4-e7e58049d417" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_ecd65962-df1f-4054-902c-a3529a9a09e0" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_Goodwill_ecd65962-df1f-4054-902c-a3529a9a09e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_8f04fad3-ce7d-4652-91e1-d736a6a7e815" 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_ConcentrationRiskLineItems_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_8f04fad3-ce7d-4652-91e1-d736a6a7e815" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_80b51443-2ea2-40ab-a1df-6eb29512bf48" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_80b51443-2ea2-40ab-a1df-6eb29512bf48" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2bc8574f-2307-4c0b-9ce1-2afdccebb088" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2bc8574f-2307-4c0b-9ce1-2afdccebb088" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_eb1d0973-b963-484f-b62a-90cc75947524" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_eb1d0973-b963-484f-b62a-90cc75947524" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_70e10eb7-4252-4e62-8dd0-8bf8f8e167fb" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_70e10eb7-4252-4e62-8dd0-8bf8f8e167fb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_1bd25ab0-33ac-484f-a1c1-e8d9afe4deee" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_1bd25ab0-33ac-484f-a1c1-e8d9afe4deee" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_2a7f3861-3c9d-4f3f-bf50-614d9d3e6768" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_2a7f3861-3c9d-4f3f-bf50-614d9d3e6768" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_fa7eabc3-150c-4d79-8c82-6f5bc9f44cd7" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_fa7eabc3-150c-4d79-8c82-6f5bc9f44cd7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_769868d4-42c3-4698-80c7-8aeca36913a0" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_769868d4-42c3-4698-80c7-8aeca36913a0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_7ce3cd24-d29c-4ab2-8e45-8d5f8a441d7c" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_AssetImpairmentCharges_7ce3cd24-d29c-4ab2-8e45-8d5f8a441d7c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_ba424fcf-980c-4a21-89c5-61a0e3bcc72f" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_ContractWithCustomerLiability_ba424fcf-980c-4a21-89c5-61a0e3bcc72f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_91f0cd4c-eeeb-41a4-b754-5395fe58c1e2" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_AssetRetirementObligationsNoncurrent_91f0cd4c-eeeb-41a4-b754-5395fe58c1e2" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserve_d61d50fb-cdc6-4d1c-bed6-338b26a3f4b1" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_SelfInsuranceReserve_d61d50fb-cdc6-4d1c-bed6-338b26a3f4b1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_f0878f3a-9b4a-4b47-b868-9e35485d0b8b" 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_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_f0878f3a-9b4a-4b47-b868-9e35485d0b8b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_3ec0fbfd-ab4b-46bd-9f01-95181fa78743" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_NumberOfOperatingSegments_3ec0fbfd-ab4b-46bd-9f01-95181fa78743" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_865377ea-c1e4-401c-ba3f-83c49e30f81a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_us-gaap_NumberOfReportableSegments_865377ea-c1e4-401c-ba3f-83c49e30f81a" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SegmentReportingNumberofMerchandiseCategories_c097151c-dd7b-41b9-ae00-054a90445749" xlink:href="casy-20240430.xsd#casy_SegmentReportingNumberofMerchandiseCategories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_bc814047-d033-493e-b740-3c741449fafc" xlink:to="loc_casy_SegmentReportingNumberofMerchandiseCategories_c097151c-dd7b-41b9-ae00-054a90445749" xlink:type="arc" order="21"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesAccountsReceivablesbyTypeDetails" xlink:type="simple" xlink:href="casy-20240430.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_4a91c682-ef28-4cd5-ab05-fd9a11a05b75" 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_c196d2e2-a5e2-44eb-a3fc-78c19e619337" 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_4a91c682-ef28-4cd5-ab05-fd9a11a05b75" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_c196d2e2-a5e2-44eb-a3fc-78c19e619337" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_a90c8abe-6e9f-44cc-9efa-524e6ceb02ac" 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_c196d2e2-a5e2-44eb-a3fc-78c19e619337" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_a90c8abe-6e9f-44cc-9efa-524e6ceb02ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_a90c8abe-6e9f-44cc-9efa-524e6ceb02ac_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_a90c8abe-6e9f-44cc-9efa-524e6ceb02ac" xlink:to="loc_us-gaap_ReceivableTypeDomain_a90c8abe-6e9f-44cc-9efa-524e6ceb02ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_c68e7072-6ed5-4872-8a94-9ec07e49ac98" 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_a90c8abe-6e9f-44cc-9efa-524e6ceb02ac" xlink:to="loc_us-gaap_ReceivableTypeDomain_c68e7072-6ed5-4872-8a94-9ec07e49ac98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_VendorRebatesMember_ceea72f7-9b59-4ec2-88dd-d4f0222e3f97" xlink:href="casy-20240430.xsd#casy_VendorRebatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_c68e7072-6ed5-4872-8a94-9ec07e49ac98" xlink:to="loc_casy_VendorRebatesMember_ceea72f7-9b59-4ec2-88dd-d4f0222e3f97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_50bddeda-6fd3-4041-9ead-253760638e9d" 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_c68e7072-6ed5-4872-8a94-9ec07e49ac98" xlink:to="loc_us-gaap_CreditCardReceivablesMember_50bddeda-6fd3-4041-9ead-253760638e9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_OtherReceivablesMember_60a30642-d372-4443-b315-f2a56bf43d5b" xlink:href="casy-20240430.xsd#casy_OtherReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_c68e7072-6ed5-4872-8a94-9ec07e49ac98" xlink:to="loc_casy_OtherReceivablesMember_60a30642-d372-4443-b315-f2a56bf43d5b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_0999113a-9068-474a-b260-f501be811eb3" 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_4a91c682-ef28-4cd5-ab05-fd9a11a05b75" xlink:to="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_0999113a-9068-474a-b260-f501be811eb3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesSummaryoftheInventoryValuesDetails" xlink:type="simple" xlink:href="casy-20240430.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_9ec178ce-a39b-41ba-80eb-5c34233690fd" 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_839b0eae-d7cb-4391-a0d5-c338a425eb09" 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_9ec178ce-a39b-41ba-80eb-5c34233690fd" xlink:to="loc_us-gaap_InventoryCurrentTable_839b0eae-d7cb-4391-a0d5-c338a425eb09" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_30c8f5c1-484a-4afe-be0f-2483d0c9ab75" 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_839b0eae-d7cb-4391-a0d5-c338a425eb09" xlink:to="loc_srt_ProductOrServiceAxis_30c8f5c1-484a-4afe-be0f-2483d0c9ab75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_30c8f5c1-484a-4afe-be0f-2483d0c9ab75_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_30c8f5c1-484a-4afe-be0f-2483d0c9ab75" xlink:to="loc_srt_ProductsAndServicesDomain_30c8f5c1-484a-4afe-be0f-2483d0c9ab75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a5664af8-f4eb-483f-9ef7-7e1a9bc25150" 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_30c8f5c1-484a-4afe-be0f-2483d0c9ab75" xlink:to="loc_srt_ProductsAndServicesDomain_a5664af8-f4eb-483f-9ef7-7e1a9bc25150" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_GasolineMember_5c9f77cf-5727-46f1-aa2e-6abf189957b3" xlink:href="casy-20240430.xsd#casy_GasolineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a5664af8-f4eb-483f-9ef7-7e1a9bc25150" xlink:to="loc_casy_GasolineMember_5c9f77cf-5727-46f1-aa2e-6abf189957b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_MerchandiseMember_316586a5-083e-4e33-bf12-3d1f3c65d285" xlink:href="casy-20240430.xsd#casy_MerchandiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a5664af8-f4eb-483f-9ef7-7e1a9bc25150" xlink:to="loc_casy_MerchandiseMember_316586a5-083e-4e33-bf12-3d1f3c65d285" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryGross_bc0a7e95-7ae6-42fb-a7ae-dc75ab8d8eee" 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_9ec178ce-a39b-41ba-80eb-5c34233690fd" xlink:to="loc_us-gaap_InventoryGross_bc0a7e95-7ae6-42fb-a7ae-dc75ab8d8eee" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/SignificantAccountingPoliciesDepreciationofPropertyandEquipmentandAmortizationofCapitalLeaseAssetsDetails" xlink:type="simple" xlink:href="casy-20240430.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_1e2f7d3a-4a7f-4f08-917e-64e7b8d2a6ef" 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_78359eb8-4481-4298-961c-220629876dfe" 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_1e2f7d3a-4a7f-4f08-917e-64e7b8d2a6ef" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_78359eb8-4481-4298-961c-220629876dfe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5975d720-39eb-4475-8960-952c6e2a2376" 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_78359eb8-4481-4298-961c-220629876dfe" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5975d720-39eb-4475-8960-952c6e2a2376" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5975d720-39eb-4475-8960-952c6e2a2376_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_5975d720-39eb-4475-8960-952c6e2a2376" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5975d720-39eb-4475-8960-952c6e2a2376_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_91cfd3bd-131e-489e-87d2-56d06890558a" 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_5975d720-39eb-4475-8960-952c6e2a2376" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_91cfd3bd-131e-489e-87d2-56d06890558a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_e1319448-3e80-421b-9b8b-d8780ad43e33" 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_91cfd3bd-131e-489e-87d2-56d06890558a" xlink:to="loc_us-gaap_BuildingMember_e1319448-3e80-421b-9b8b-d8780ad43e33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_6e2feb7b-8aaa-4c84-9b75-a796f3b3453a" 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_91cfd3bd-131e-489e-87d2-56d06890558a" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_6e2feb7b-8aaa-4c84-9b75-a796f3b3453a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_cabcad76-16df-4021-977a-e2dc173e38fd" 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_78359eb8-4481-4298-961c-220629876dfe" xlink:to="loc_srt_RangeAxis_cabcad76-16df-4021-977a-e2dc173e38fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_cabcad76-16df-4021-977a-e2dc173e38fd_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_cabcad76-16df-4021-977a-e2dc173e38fd" xlink:to="loc_srt_RangeMember_cabcad76-16df-4021-977a-e2dc173e38fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f5846d0c-8a54-4143-8f97-39eab4107cec" 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_cabcad76-16df-4021-977a-e2dc173e38fd" xlink:to="loc_srt_RangeMember_f5846d0c-8a54-4143-8f97-39eab4107cec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_09195a14-ff96-478c-a920-614157f0f8f9" 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_f5846d0c-8a54-4143-8f97-39eab4107cec" xlink:to="loc_srt_MinimumMember_09195a14-ff96-478c-a920-614157f0f8f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_619c76aa-04da-4111-ad8e-b59043f082c6" 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_f5846d0c-8a54-4143-8f97-39eab4107cec" xlink:to="loc_srt_MaximumMember_619c76aa-04da-4111-ad8e-b59043f082c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_ef75abbd-e82c-4d73-8aa7-2f21be28afba" 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_1e2f7d3a-4a7f-4f08-917e-64e7b8d2a6ef" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_ef75abbd-e82c-4d73-8aa7-2f21be28afba" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="casy-20240430.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_fdd4d092-0a81-4fe6-80e7-7d6887183cd1" 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_24fc43c8-b4bd-4cef-a5d0-fb11e3562e77" 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_fdd4d092-0a81-4fe6-80e7-7d6887183cd1" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_24fc43c8-b4bd-4cef-a5d0-fb11e3562e77" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_df0e1f65-b5f5-426c-8313-df8982d903b0" 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_24fc43c8-b4bd-4cef-a5d0-fb11e3562e77" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_df0e1f65-b5f5-426c-8313-df8982d903b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_df0e1f65-b5f5-426c-8313-df8982d903b0_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_df0e1f65-b5f5-426c-8313-df8982d903b0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_df0e1f65-b5f5-426c-8313-df8982d903b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fd8406b1-e348-49c0-b866-ebdeb482365f" 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_df0e1f65-b5f5-426c-8313-df8982d903b0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fd8406b1-e348-49c0-b866-ebdeb482365f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_3eb2c02b-0494-4c25-b272-712166423e27" 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_fd8406b1-e348-49c0-b866-ebdeb482365f" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_3eb2c02b-0494-4c25-b272-712166423e27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_MinitMartMember_0c7b61a8-aa92-47e1-b10a-db819e500897" xlink:href="casy-20240430.xsd#casy_MinitMartMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fd8406b1-e348-49c0-b866-ebdeb482365f" xlink:to="loc_casy_MinitMartMember_0c7b61a8-aa92-47e1-b10a-db819e500897" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfStores_6fe33c2b-b877-4b25-b220-785c59bf88fe" 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_fdd4d092-0a81-4fe6-80e7-7d6887183cd1" xlink:to="loc_us-gaap_NumberOfStores_6fe33c2b-b877-4b25-b220-785c59bf88fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_60216c0a-9b3e-4924-83f1-4adeb19b4d59" 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_fdd4d092-0a81-4fe6-80e7-7d6887183cd1" xlink:to="loc_us-gaap_Goodwill_60216c0a-9b3e-4924-83f1-4adeb19b4d59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_4aed5e87-eb5e-4637-97be-740f9101c80b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_fdd4d092-0a81-4fe6-80e7-7d6887183cd1" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_4aed5e87-eb5e-4637-97be-740f9101c80b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_e51201c9-fa69-4f28-aecc-8b6efaa1ccb4" 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_fdd4d092-0a81-4fe6-80e7-7d6887183cd1" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_e51201c9-fa69-4f28-aecc-8b6efaa1ccb4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_39d86ec0-6cbf-488e-a0a3-7b6a5e0406c1" 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_fdd4d092-0a81-4fe6-80e7-7d6887183cd1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_39d86ec0-6cbf-488e-a0a3-7b6a5e0406c1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/AcquisitionsAllocationofPurchasePriceDetails" xlink:type="simple" xlink:href="casy-20240430.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_a7e0bd28-d31a-4f00-976b-4b858b0f3854" 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_6907490b-87ea-4759-ab58-35f49965bc39" 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_a7e0bd28-d31a-4f00-976b-4b858b0f3854" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6907490b-87ea-4759-ab58-35f49965bc39" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_866af461-5c77-47fc-9216-e394548d75d2" 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_6907490b-87ea-4759-ab58-35f49965bc39" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_866af461-5c77-47fc-9216-e394548d75d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_866af461-5c77-47fc-9216-e394548d75d2_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_866af461-5c77-47fc-9216-e394548d75d2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_866af461-5c77-47fc-9216-e394548d75d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9b5c4865-613e-4186-b180-85d13d8071f2" 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_866af461-5c77-47fc-9216-e394548d75d2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9b5c4865-613e-4186-b180-85d13d8071f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_8f068dd0-1049-476f-9635-65542e5887ee" 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_9b5c4865-613e-4186-b180-85d13d8071f2" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_8f068dd0-1049-476f-9635-65542e5887ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" 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_a7e0bd28-d31a-4f00-976b-4b858b0f3854" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_bcdfd504-13ac-48df-bf29-b97f00100661" 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_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_bcdfd504-13ac-48df-bf29-b97f00100661" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_38e77a07-d141-44db-87d6-fac8c5ce3b0a" 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_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_38e77a07-d141-44db-87d6-fac8c5ce3b0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseRightOfUseAsset_4d432a4a-d11a-4612-9f64-0f50d341843b" xlink:href="casy-20240430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseRightOfUseAsset_4d432a4a-d11a-4612-9f64-0f50d341843b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAsset_a4cb6774-e8b1-4f25-8250-55f3621fb330" xlink:href="casy-20240430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAsset_a4cb6774-e8b1-4f25-8250-55f3621fb330" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_6769ca6c-30b4-416d-928b-cf694a42a06c" 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_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_6769ca6c-30b4-416d-928b-cf694a42a06c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_ed5a7beb-27f3-4e4e-99c6-dc974d3a1284" 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_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:to="loc_us-gaap_Goodwill_ed5a7beb-27f3-4e4e-99c6-dc974d3a1284" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_d8bbf308-cd66-4b91-a73f-6fc5fefd911a" 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_6eafbe39-c3f6-4fc1-bb3a-fc269105e575" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_d8bbf308-cd66-4b91-a73f-6fc5fefd911a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_049807cf-11da-4bc4-a13c-de705cb9bfb6" 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_a7e0bd28-d31a-4f00-976b-4b858b0f3854" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_049807cf-11da-4bc4-a13c-de705cb9bfb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_dce33486-9acb-4a5b-be4a-97152e0acd5d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_049807cf-11da-4bc4-a13c-de705cb9bfb6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_dce33486-9acb-4a5b-be4a-97152e0acd5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseLiability_f964ef69-7e71-48ac-b364-4abcd1fbde2e" xlink:href="casy-20240430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_049807cf-11da-4bc4-a13c-de705cb9bfb6" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinanceLeaseLiability_f964ef69-7e71-48ac-b364-4abcd1fbde2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities_a77c33e4-8d23-4925-80bc-3dba96c3ddd2" xlink:href="casy-20240430.xsd#casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_049807cf-11da-4bc4-a13c-de705cb9bfb6" xlink:to="loc_casy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities_a77c33e4-8d23-4925-80bc-3dba96c3ddd2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_62aafbfd-5eb7-4023-9e29-d1f4858d649b" 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_049807cf-11da-4bc4-a13c-de705cb9bfb6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_62aafbfd-5eb7-4023-9e29-d1f4858d649b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_e9d2fb9e-b996-43a5-bb3b-60ce9cb81772" 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_a7e0bd28-d31a-4f00-976b-4b858b0f3854" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_e9d2fb9e-b996-43a5-bb3b-60ce9cb81772" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/FairValueofFinancialInstrumentsandLongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="casy-20240430.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_2bde219c-2f91-419c-a548-2b68d09a5bbd" 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_bc4f8b34-505b-470d-aa4f-2cb980e27119" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_DebtInstrumentTable_bc4f8b34-505b-470d-aa4f-2cb980e27119" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_99500ed5-7f61-4f48-a025-e97b88e72ade" 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_bc4f8b34-505b-470d-aa4f-2cb980e27119" xlink:to="loc_srt_RangeAxis_99500ed5-7f61-4f48-a025-e97b88e72ade" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_99500ed5-7f61-4f48-a025-e97b88e72ade_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_99500ed5-7f61-4f48-a025-e97b88e72ade" xlink:to="loc_srt_RangeMember_99500ed5-7f61-4f48-a025-e97b88e72ade_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4094aa55-2bcb-45a3-8774-dae6c63dc4b1" 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_99500ed5-7f61-4f48-a025-e97b88e72ade" xlink:to="loc_srt_RangeMember_4094aa55-2bcb-45a3-8774-dae6c63dc4b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2d3752e5-5bfe-40dd-a48d-cce22921f191" 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_4094aa55-2bcb-45a3-8774-dae6c63dc4b1" xlink:to="loc_srt_MinimumMember_2d3752e5-5bfe-40dd-a48d-cce22921f191" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_dbd185ef-2154-41e0-930d-85d2df1397df" 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_4094aa55-2bcb-45a3-8774-dae6c63dc4b1" xlink:to="loc_srt_MaximumMember_dbd185ef-2154-41e0-930d-85d2df1397df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_7d92a1be-0cbd-44f5-9631-33cc01f6bdff" 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_bc4f8b34-505b-470d-aa4f-2cb980e27119" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_7d92a1be-0cbd-44f5-9631-33cc01f6bdff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7d92a1be-0cbd-44f5-9631-33cc01f6bdff_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_7d92a1be-0cbd-44f5-9631-33cc01f6bdff" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7d92a1be-0cbd-44f5-9631-33cc01f6bdff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6cbd7684-06be-4264-8b8f-677e2dca6cb6" 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_7d92a1be-0cbd-44f5-9631-33cc01f6bdff" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6cbd7684-06be-4264-8b8f-677e2dca6cb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_5c3c5d83-36ff-4596-b1d9-c8a604bc541f" 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_6cbd7684-06be-4264-8b8f-677e2dca6cb6" xlink:to="loc_us-gaap_LineOfCreditMember_5c3c5d83-36ff-4596-b1d9-c8a604bc541f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_ee6e2644-6b86-4f9d-bdea-c2e3a3939d37" 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_bc4f8b34-505b-470d-aa4f-2cb980e27119" xlink:to="loc_us-gaap_DebtInstrumentAxis_ee6e2644-6b86-4f9d-bdea-c2e3a3939d37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ee6e2644-6b86-4f9d-bdea-c2e3a3939d37_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_ee6e2644-6b86-4f9d-bdea-c2e3a3939d37" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ee6e2644-6b86-4f9d-bdea-c2e3a3939d37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_dc6e1f3e-4d3b-4ec4-bd1e-52909b269d3c" 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_ee6e2644-6b86-4f9d-bdea-c2e3a3939d37" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_dc6e1f3e-4d3b-4ec4-bd1e-52909b269d3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_NewCreditAgreementTermLoanFacilityMember_c4c38e20-ae03-4682-8beb-98ce4ec09533" xlink:href="casy-20240430.xsd#casy_NewCreditAgreementTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dc6e1f3e-4d3b-4ec4-bd1e-52909b269d3c" xlink:to="loc_casy_NewCreditAgreementTermLoanFacilityMember_c4c38e20-ae03-4682-8beb-98ce4ec09533" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_NewCreditAgreementRevolvingCreditFacilityMember_6a266ac1-844d-4ff4-9f4e-e191415dee60" xlink:href="casy-20240430.xsd#casy_NewCreditAgreementRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dc6e1f3e-4d3b-4ec4-bd1e-52909b269d3c" xlink:to="loc_casy_NewCreditAgreementRevolvingCreditFacilityMember_6a266ac1-844d-4ff4-9f4e-e191415dee60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_CreditFacilitiesMember_a9199be8-5bca-4877-aeb1-2f302abf3707" xlink:href="casy-20240430.xsd#casy_CreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dc6e1f3e-4d3b-4ec4-bd1e-52909b269d3c" xlink:to="loc_casy_CreditFacilitiesMember_a9199be8-5bca-4877-aeb1-2f302abf3707" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TermLoanFacilityMember_d236d077-bfd3-47fc-a435-f80c1e8530c9" xlink:href="casy-20240430.xsd#casy_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dc6e1f3e-4d3b-4ec4-bd1e-52909b269d3c" xlink:to="loc_casy_TermLoanFacilityMember_d236d077-bfd3-47fc-a435-f80c1e8530c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_BankLineMember_d517bc5e-389d-4b68-9838-91fa07a750da" xlink:href="casy-20240430.xsd#casy_BankLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dc6e1f3e-4d3b-4ec4-bd1e-52909b269d3c" xlink:to="loc_casy_BankLineMember_d517bc5e-389d-4b68-9838-91fa07a750da" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_63100bb0-6805-4aec-bd06-67ce14a24bcb" 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_bc4f8b34-505b-470d-aa4f-2cb980e27119" xlink:to="loc_us-gaap_CreditFacilityAxis_63100bb0-6805-4aec-bd06-67ce14a24bcb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_63100bb0-6805-4aec-bd06-67ce14a24bcb_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_63100bb0-6805-4aec-bd06-67ce14a24bcb" xlink:to="loc_us-gaap_CreditFacilityDomain_63100bb0-6805-4aec-bd06-67ce14a24bcb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_c3c2d8ea-ea44-4b0b-aee7-79ed5329ac86" 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_63100bb0-6805-4aec-bd06-67ce14a24bcb" xlink:to="loc_us-gaap_CreditFacilityDomain_c3c2d8ea-ea44-4b0b-aee7-79ed5329ac86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_ca4f9d16-c61d-47ea-a48d-cb390d6c9af5" 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_c3c2d8ea-ea44-4b0b-aee7-79ed5329ac86" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_ca4f9d16-c61d-47ea-a48d-cb390d6c9af5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_dec48387-43e0-48de-b8b5-7ed812185817" 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_c3c2d8ea-ea44-4b0b-aee7-79ed5329ac86" xlink:to="loc_us-gaap_LineOfCreditMember_dec48387-43e0-48de-b8b5-7ed812185817" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_e431d8ec-e6e1-430a-a09e-3a0ddef054df" 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_c3c2d8ea-ea44-4b0b-aee7-79ed5329ac86" xlink:to="loc_us-gaap_LetterOfCreditMember_e431d8ec-e6e1-430a-a09e-3a0ddef054df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_312c5185-c489-4ef0-a733-f6e2ae594f99" 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_bc4f8b34-505b-470d-aa4f-2cb980e27119" xlink:to="loc_us-gaap_VariableRateAxis_312c5185-c489-4ef0-a733-f6e2ae594f99" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_312c5185-c489-4ef0-a733-f6e2ae594f99_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_312c5185-c489-4ef0-a733-f6e2ae594f99" xlink:to="loc_us-gaap_VariableRateDomain_312c5185-c489-4ef0-a733-f6e2ae594f99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_3fcd904f-509c-4b6a-860e-5b1a5310a32d" 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_312c5185-c489-4ef0-a733-f6e2ae594f99" xlink:to="loc_us-gaap_VariableRateDomain_3fcd904f-509c-4b6a-860e-5b1a5310a32d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_d363c743-8328-445b-83ef-1a02fe319057" 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_3fcd904f-509c-4b6a-860e-5b1a5310a32d" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_d363c743-8328-445b-83ef-1a02fe319057" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_1cc8eb20-14b1-402a-93ee-ad9baaa3eaf6" 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_3fcd904f-509c-4b6a-860e-5b1a5310a32d" xlink:to="loc_us-gaap_BaseRateMember_1cc8eb20-14b1-402a-93ee-ad9baaa3eaf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_AdjustedDailySimpleSecuredOvernightFinancingRateMember_37ff5f20-f6ac-41ca-adfc-0cab3129348f" xlink:href="casy-20240430.xsd#casy_AdjustedDailySimpleSecuredOvernightFinancingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_3fcd904f-509c-4b6a-860e-5b1a5310a32d" xlink:to="loc_casy_AdjustedDailySimpleSecuredOvernightFinancingRateMember_37ff5f20-f6ac-41ca-adfc-0cab3129348f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_47f21112-61c9-4d64-be23-04b714e76021" 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_3fcd904f-509c-4b6a-860e-5b1a5310a32d" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_47f21112-61c9-4d64-be23-04b714e76021" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_AlternateBaseRateMember_84182e0e-5602-4e0f-8f9d-e7af7b545781" xlink:href="casy-20240430.xsd#casy_AlternateBaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_3fcd904f-509c-4b6a-860e-5b1a5310a32d" xlink:to="loc_casy_AlternateBaseRateMember_84182e0e-5602-4e0f-8f9d-e7af7b545781" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_5c5fb728-e07b-45e5-8f7b-94743721dfac" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_LongTermDebtFairValue_5c5fb728-e07b-45e5-8f7b-94743721dfac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_91c86072-ab7d-45fe-a0fa-a73bc87cbcac" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_FinanceLeaseLiability_91c86072-ab7d-45fe-a0fa-a73bc87cbcac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList_003db399-f5be-4641-b619-8c7c7b97f9d7" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList_003db399-f5be-4641-b619-8c7c7b97f9d7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_a5a7f632-b84e-460d-9472-802f96daf5ba" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_a5a7f632-b84e-460d-9472-802f96daf5ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_c97ddbe3-24bb-4a00-8344-44609e5895d6" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_c97ddbe3-24bb-4a00-8344-44609e5895d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_ec97fac8-da19-4527-80da-df9d97dac415" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_ec97fac8-da19-4527-80da-df9d97dac415" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_DebtInstrumentPeriodicPaymentPercentageOfPrincipal_03a781e0-7915-4ac4-a3b5-5c0eae3a7172" xlink:href="casy-20240430.xsd#casy_DebtInstrumentPeriodicPaymentPercentageOfPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_casy_DebtInstrumentPeriodicPaymentPercentageOfPrincipal_03a781e0-7915-4ac4-a3b5-5c0eae3a7172" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_LineOfCreditFacilityMaximumBorrowingCapacityIncrease_6ff88c05-4b04-4980-88e6-591fb8e84a1b" xlink:href="casy-20240430.xsd#casy_LineOfCreditFacilityMaximumBorrowingCapacityIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_casy_LineOfCreditFacilityMaximumBorrowingCapacityIncrease_6ff88c05-4b04-4980-88e6-591fb8e84a1b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_LineOfCreditMaximumIncreaseInBorrowingCapacityAsAPercentageOfConsolidatedEBITDA_1e298cec-8ffb-48cc-bb0a-850ed4c5277e" xlink:href="casy-20240430.xsd#casy_LineOfCreditMaximumIncreaseInBorrowingCapacityAsAPercentageOfConsolidatedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_casy_LineOfCreditMaximumIncreaseInBorrowingCapacityAsAPercentageOfConsolidatedEBITDA_1e298cec-8ffb-48cc-bb0a-850ed4c5277e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_789c0537-35d6-4f12-84d7-9a73ec5b4f47" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_789c0537-35d6-4f12-84d7-9a73ec5b4f47" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_f7286461-01ef-4df6-911c-c189df2ef0f7" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_f7286461-01ef-4df6-911c-c189df2ef0f7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_754f75d3-9fba-428e-9bad-41d1b05c13a0" 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_2bde219c-2f91-419c-a548-2b68d09a5bbd" xlink:to="loc_us-gaap_InterestCostsCapitalized_754f75d3-9fba-428e-9bad-41d1b05c13a0" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/FairValueofFinancialInstrumentsandLongTermDebtCarryingValueofLongtermDebtDetails" xlink:type="simple" xlink:href="casy-20240430.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_d00241e3-912a-433c-93c3-becbf8d18875" 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_4c02a6eb-ed4c-4b5b-9d6c-910ba198ba93" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_DebtInstrumentTable_4c02a6eb-ed4c-4b5b-9d6c-910ba198ba93" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_1b50de09-ad45-4383-87dc-650499b67313" 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_4c02a6eb-ed4c-4b5b-9d6c-910ba198ba93" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_1b50de09-ad45-4383-87dc-650499b67313" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1b50de09-ad45-4383-87dc-650499b67313_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_1b50de09-ad45-4383-87dc-650499b67313" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1b50de09-ad45-4383-87dc-650499b67313_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_78667be7-a0fd-4ad0-aa17-1268532501d7" 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_1b50de09-ad45-4383-87dc-650499b67313" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_78667be7-a0fd-4ad0-aa17-1268532501d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_5a516733-ebb6-4782-96f2-b2ec93ef1d74" 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_78667be7-a0fd-4ad0-aa17-1268532501d7" xlink:to="loc_us-gaap_SeniorNotesMember_5a516733-ebb6-4782-96f2-b2ec93ef1d74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_b460913e-3c44-4690-8c1f-8e2883a8814f" 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_78667be7-a0fd-4ad0-aa17-1268532501d7" xlink:to="loc_us-gaap_LineOfCreditMember_b460913e-3c44-4690-8c1f-8e2883a8814f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cfc29b93-02c4-47be-962c-f6fb6f94ed12" 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_4c02a6eb-ed4c-4b5b-9d6c-910ba198ba93" xlink:to="loc_us-gaap_DebtInstrumentAxis_cfc29b93-02c4-47be-962c-f6fb6f94ed12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cfc29b93-02c4-47be-962c-f6fb6f94ed12_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_cfc29b93-02c4-47be-962c-f6fb6f94ed12" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cfc29b93-02c4-47be-962c-f6fb6f94ed12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" 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_cfc29b93-02c4-47be-962c-f6fb6f94ed12" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSixSevenSeniorNotesDueJune152028Member_407f4363-01a0-4bdd-8b3e-06afe0468af5" xlink:href="casy-20240430.xsd#casy_ThreePointSixSevenSeniorNotesDueJune152028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_ThreePointSixSevenSeniorNotesDueJune152028Member_407f4363-01a0-4bdd-8b3e-06afe0468af5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSevenFiveSeniorNotesDueDecember182028Member_1c54dd2f-a416-41b9-a36c-504504177a38" xlink:href="casy-20240430.xsd#casy_ThreePointSevenFiveSeniorNotesDueDecember182028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_ThreePointSevenFiveSeniorNotesDueDecember182028Member_1c54dd2f-a416-41b9-a36c-504504177a38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSixFiveSeniorNotesDueMay22031Member_d1d7a084-25f6-490a-8c05-f67840333ed8" xlink:href="casy-20240430.xsd#casy_ThreePointSixFiveSeniorNotesDueMay22031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_ThreePointSixFiveSeniorNotesDueMay22031Member_d1d7a084-25f6-490a-8c05-f67840333ed8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSevenTwoSeniorNotesDueTwentyThirtyOneMember_b5ebe034-64aa-4d66-89dd-21b63cec131c" xlink:href="casy-20240430.xsd#casy_ThreePointSevenTwoSeniorNotesDueTwentyThirtyOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_ThreePointSevenTwoSeniorNotesDueTwentyThirtyOneMember_b5ebe034-64aa-4d66-89dd-21b63cec131c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointFiveOneSeniorNotesDueJune132025Member_53e0edd2-e56e-42b7-943b-5c23c1211ed8" xlink:href="casy-20240430.xsd#casy_ThreePointFiveOneSeniorNotesDueJune132025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_ThreePointFiveOneSeniorNotesDueJune132025Member_53e0edd2-e56e-42b7-943b-5c23c1211ed8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ThreePointSevenSevenSeniorNotesdueAugust222028Member_7ada07f9-9ae8-40e9-9572-17c0c665a6db" xlink:href="casy-20240430.xsd#casy_ThreePointSevenSevenSeniorNotesdueAugust222028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_ThreePointSevenSevenSeniorNotesdueAugust222028Member_7ada07f9-9ae8-40e9-9572-17c0c665a6db" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TwoPointEightFiveSeniorNotesDueAugust72030Member_60733cf4-4e8d-4f1b-93cf-02841e635b0d" xlink:href="casy-20240430.xsd#casy_TwoPointEightFiveSeniorNotesDueAugust72030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_TwoPointEightFiveSeniorNotesDueAugust72030Member_60733cf4-4e8d-4f1b-93cf-02841e635b0d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TwoPointNineSixSeniorNotesDueAugust62032Member_e449b182-bc4e-4633-bca6-23c6c0e0aee8" xlink:href="casy-20240430.xsd#casy_TwoPointNineSixSeniorNotesDueAugust62032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_TwoPointNineSixSeniorNotesDueAugust62032Member_e449b182-bc4e-4633-bca6-23c6c0e0aee8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_TermLoanFacilityMember_9c57755b-5994-4eca-a35a-305c56a6ac08" xlink:href="casy-20240430.xsd#casy_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb15655a-9f95-427d-ac6e-fa19691d1a98" xlink:to="loc_casy_TermLoanFacilityMember_9c57755b-5994-4eca-a35a-305c56a6ac08" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_30fd2c0d-446e-4b19-9981-58d092517cf0" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_30fd2c0d-446e-4b19-9981-58d092517cf0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_DebtInstrumentPeriodicPaymentNumberofPayments_9476d16a-bd2b-4b49-af74-c06f08665aac" xlink:href="casy-20240430.xsd#casy_DebtInstrumentPeriodicPaymentNumberofPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_casy_DebtInstrumentPeriodicPaymentNumberofPayments_9476d16a-bd2b-4b49-af74-c06f08665aac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_ba5e7123-54b1-4450-8c14-1a55b013909f" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_FinanceLeaseLiability_ba5e7123-54b1-4450-8c14-1a55b013909f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_3f7e3f1d-347a-45b3-8ae0-a4c50b596719" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_LongTermDebt_3f7e3f1d-347a-45b3-8ae0-a4c50b596719" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_b45f1719-eb67-4a31-a6a3-cf4d84d9834b" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_b45f1719-eb67-4a31-a6a3-cf4d84d9834b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_1d163b4b-5b99-46a2-9517-ab7784b2f76a" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_1d163b4b-5b99-46a2-9517-ab7784b2f76a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_9cd08ef6-e5b5-4051-b46a-66f409310b47" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_9cd08ef6-e5b5-4051-b46a-66f409310b47" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_f365996c-ad47-4aa4-9e7a-180264fa695f" 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_d00241e3-912a-433c-93c3-becbf8d18875" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_f365996c-ad47-4aa4-9e7a-180264fa695f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/PreferredandCommonStockDetails" xlink:type="simple" xlink:href="casy-20240430.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_9720b9df-f06d-495f-b708-0e779b0463ea" 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_c8dcb3d8-6498-4e70-9526-3bfbb0e7f628" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c8dcb3d8-6498-4e70-9526-3bfbb0e7f628" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_f4328917-07ac-4b68-83da-6746deb499ff" 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_c8dcb3d8-6498-4e70-9526-3bfbb0e7f628" xlink:to="loc_us-gaap_StatementClassOfStockAxis_f4328917-07ac-4b68-83da-6746deb499ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f4328917-07ac-4b68-83da-6746deb499ff_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_f4328917-07ac-4b68-83da-6746deb499ff" xlink:to="loc_us-gaap_ClassOfStockDomain_f4328917-07ac-4b68-83da-6746deb499ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_e46f4748-2c33-48a9-8df6-d704cd357edd" 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_f4328917-07ac-4b68-83da-6746deb499ff" xlink:to="loc_us-gaap_ClassOfStockDomain_e46f4748-2c33-48a9-8df6-d704cd357edd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_d0132ba4-233b-4ce3-b71b-11a19118734f" 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_e46f4748-2c33-48a9-8df6-d704cd357edd" xlink:to="loc_us-gaap_PreferredStockMember_d0132ba4-233b-4ce3-b71b-11a19118734f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_e16e2593-f607-4c59-a3d5-b6d595f47d28" 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_e46f4748-2c33-48a9-8df6-d704cd357edd" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_e16e2593-f607-4c59-a3d5-b6d595f47d28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_54799573-9b93-422d-9ff5-a7b4ff4c8ae9" 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_e46f4748-2c33-48a9-8df6-d704cd357edd" xlink:to="loc_us-gaap_CommonStockMember_54799573-9b93-422d-9ff5-a7b4ff4c8ae9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_01890a3f-3483-440e-a5d1-21d37b20efd2" 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_c8dcb3d8-6498-4e70-9526-3bfbb0e7f628" xlink:to="loc_us-gaap_PlanNameAxis_01890a3f-3483-440e-a5d1-21d37b20efd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_01890a3f-3483-440e-a5d1-21d37b20efd2_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_01890a3f-3483-440e-a5d1-21d37b20efd2" xlink:to="loc_us-gaap_PlanNameDomain_01890a3f-3483-440e-a5d1-21d37b20efd2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b2efce26-2611-4632-aa76-2ff02abdf157" 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_01890a3f-3483-440e-a5d1-21d37b20efd2" xlink:to="loc_us-gaap_PlanNameDomain_b2efce26-2611-4632-aa76-2ff02abdf157" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_StockIncentivePlanMember_43ee96c9-cab9-4636-bf3d-212cd819bf9c" xlink:href="casy-20240430.xsd#casy_StockIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b2efce26-2611-4632-aa76-2ff02abdf157" xlink:to="loc_casy_StockIncentivePlanMember_43ee96c9-cab9-4636-bf3d-212cd819bf9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_31d7ee08-6d21-469a-8e46-231b2cd896d2" 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_c8dcb3d8-6498-4e70-9526-3bfbb0e7f628" xlink:to="loc_us-gaap_AwardTypeAxis_31d7ee08-6d21-469a-8e46-231b2cd896d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_31d7ee08-6d21-469a-8e46-231b2cd896d2_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_31d7ee08-6d21-469a-8e46-231b2cd896d2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_31d7ee08-6d21-469a-8e46-231b2cd896d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_780ac5aa-9ec0-4077-8bac-40a355ded535" 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_31d7ee08-6d21-469a-8e46-231b2cd896d2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_780ac5aa-9ec0-4077-8bac-40a355ded535" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_9923f5ae-5413-47ab-84a1-ee12d259e63c" 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_780ac5aa-9ec0-4077-8bac-40a355ded535" xlink:to="loc_us-gaap_EmployeeStockOptionMember_9923f5ae-5413-47ab-84a1-ee12d259e63c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_cb04fe0e-e350-4792-8de3-1d577cce5b64" 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_780ac5aa-9ec0-4077-8bac-40a355ded535" xlink:to="loc_us-gaap_RestrictedStockMember_cb04fe0e-e350-4792-8de3-1d577cce5b64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_RestrictedStockUnitsTimeBasedMember_71445040-fb0c-41c0-80c0-664682dd790f" xlink:href="casy-20240430.xsd#casy_RestrictedStockUnitsTimeBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_780ac5aa-9ec0-4077-8bac-40a355ded535" xlink:to="loc_casy_RestrictedStockUnitsTimeBasedMember_71445040-fb0c-41c0-80c0-664682dd790f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_RestrictedStockUnitsRSUsPerformanceBasedMember_1ed994d6-2242-4e55-bf0e-a6fd68eac26d" xlink:href="casy-20240430.xsd#casy_RestrictedStockUnitsRSUsPerformanceBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_780ac5aa-9ec0-4077-8bac-40a355ded535" xlink:to="loc_casy_RestrictedStockUnitsRSUsPerformanceBasedMember_1ed994d6-2242-4e55-bf0e-a6fd68eac26d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_f56eaeb5-d330-412d-a563-8aa84db6919e" 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_780ac5aa-9ec0-4077-8bac-40a355ded535" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_f56eaeb5-d330-412d-a563-8aa84db6919e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6d50a7c1-3640-41f1-9723-f766bccb90ef" 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_c8dcb3d8-6498-4e70-9526-3bfbb0e7f628" xlink:to="loc_srt_RangeAxis_6d50a7c1-3640-41f1-9723-f766bccb90ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6d50a7c1-3640-41f1-9723-f766bccb90ef_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_6d50a7c1-3640-41f1-9723-f766bccb90ef" xlink:to="loc_srt_RangeMember_6d50a7c1-3640-41f1-9723-f766bccb90ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ba46306e-d382-4650-beac-3a0e165055b1" 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_6d50a7c1-3640-41f1-9723-f766bccb90ef" xlink:to="loc_srt_RangeMember_ba46306e-d382-4650-beac-3a0e165055b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_34c7338c-9e5d-4c58-9775-72214295c5a5" 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_ba46306e-d382-4650-beac-3a0e165055b1" xlink:to="loc_srt_MinimumMember_34c7338c-9e5d-4c58-9775-72214295c5a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e54bb0fd-3c3d-4535-be7c-a6d3f18755a6" 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_ba46306e-d382-4650-beac-3a0e165055b1" xlink:to="loc_srt_MaximumMember_e54bb0fd-3c3d-4535-be7c-a6d3f18755a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_d7a1e8b8-8d89-420c-8711-7904cec373ba" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_d7a1e8b8-8d89-420c-8711-7904cec373ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_9857991b-0e5f-472a-9a51-c0671ba8a4b3" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_PreferredStockSharesIssued_9857991b-0e5f-472a-9a51-c0671ba8a4b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_cf920e1f-c168-4030-81a2-8c1afc6b5dbe" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_cf920e1f-c168-4030-81a2-8c1afc6b5dbe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerStockOptionIssued_d57008d4-a16c-4d0f-aaf9-ba2dc3e86193" xlink:href="casy-20240430.xsd#casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerStockOptionIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerStockOptionIssued_d57008d4-a16c-4d0f-aaf9-ba2dc3e86193" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerEquityInstrumentsOtherOptionsIssued_3e6afb4e-bff7-41b9-95ab-9cc6bde36068" xlink:href="casy-20240430.xsd#casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerEquityInstrumentsOtherOptionsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_casy_SharebasedCompensationArrangementsBySharebasedPaymentAwardNumberOfSharesAvailableForGrantReductionPerEquityInstrumentsOtherOptionsIssued_3e6afb4e-bff7-41b9-95ab-9cc6bde36068" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b0e801dd-2f02-4700-b517-f6ee0b21ddb0" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b0e801dd-2f02-4700-b517-f6ee0b21ddb0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_68c269e6-8302-477f-8680-beacf4e67d3b" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_68c269e6-8302-477f-8680-beacf4e67d3b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_291f2db2-015d-44a1-9207-8e35bd72af59" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_291f2db2-015d-44a1-9207-8e35bd72af59" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_8b54ce84-543f-4a80-832d-93d4ce517ed6" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_8b54ce84-543f-4a80-832d-93d4ce517ed6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_0c33abc6-f6ac-4e1e-9958-4b503685d0e6" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_0c33abc6-f6ac-4e1e-9958-4b503685d0e6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_7b516fe9-5769-4a1e-9364-09323b23fe7b" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_7b516fe9-5769-4a1e-9364-09323b23fe7b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_799bd215-43c4-4160-b4c2-adcc2615a3ea" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_799bd215-43c4-4160-b4c2-adcc2615a3ea" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_0f96684c-c6a8-410b-8ca3-23fe3406ff61" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_0f96684c-c6a8-410b-8ca3-23fe3406ff61" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_6b44327e-77cc-419f-b618-5caa51c41156" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_6b44327e-77cc-419f-b618-5caa51c41156" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_c820567d-07ac-4e2c-8971-f3c7591360f9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_c820567d-07ac-4e2c-8971-f3c7591360f9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_6df029b4-929a-4cef-9b39-a8120e4e29ee" 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_9720b9df-f06d-495f-b708-0e779b0463ea" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_6df029b4-929a-4cef-9b39-a8120e4e29ee" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/PreferredandCommonStockScheduleofRestrictedStockUnitsAwardActivityDetails" xlink:type="simple" xlink:href="casy-20240430.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_669f8bc9-0893-4b05-8107-2d1b5c8407c3" 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_d6cfb0a9-10dc-4865-a8b2-3159248ea18b" 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_669f8bc9-0893-4b05-8107-2d1b5c8407c3" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6cfb0a9-10dc-4865-a8b2-3159248ea18b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_844fcfb0-a161-4461-8fe8-8b544342fa8d" 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_d6cfb0a9-10dc-4865-a8b2-3159248ea18b" xlink:to="loc_us-gaap_AwardTypeAxis_844fcfb0-a161-4461-8fe8-8b544342fa8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_844fcfb0-a161-4461-8fe8-8b544342fa8d_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_844fcfb0-a161-4461-8fe8-8b544342fa8d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_844fcfb0-a161-4461-8fe8-8b544342fa8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_323199eb-9971-4ae5-a64f-a34b85025b4c" 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_844fcfb0-a161-4461-8fe8-8b544342fa8d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_323199eb-9971-4ae5-a64f-a34b85025b4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_3ad978ae-365f-409e-b51d-2dd2e8ed2eda" 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_323199eb-9971-4ae5-a64f-a34b85025b4c" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_3ad978ae-365f-409e-b51d-2dd2e8ed2eda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a96e42b9-0ecd-43eb-9af5-fb99a51fbd71" 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_669f8bc9-0893-4b05-8107-2d1b5c8407c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a96e42b9-0ecd-43eb-9af5-fb99a51fbd71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0c2fd60d-46a7-4023-ab92-1d4cb066199f" 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_a96e42b9-0ecd-43eb-9af5-fb99a51fbd71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0c2fd60d-46a7-4023-ab92-1d4cb066199f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_b27ad89d-d7b6-499a-8f7f-846282851460" 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_a96e42b9-0ecd-43eb-9af5-fb99a51fbd71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_b27ad89d-d7b6-499a-8f7f-846282851460" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_eafe7ea9-059f-4f2a-8ea5-86811ed280e3" 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_a96e42b9-0ecd-43eb-9af5-fb99a51fbd71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_eafe7ea9-059f-4f2a-8ea5-86811ed280e3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0f581276-6ceb-43ff-8fc0-e71b2015681e" 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_a96e42b9-0ecd-43eb-9af5-fb99a51fbd71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0f581276-6ceb-43ff-8fc0-e71b2015681e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriod_0e96f8ea-f4a9-4b4a-982a-48edbf1d6003" xlink:href="casy-20240430.xsd#casy_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a96e42b9-0ecd-43eb-9af5-fb99a51fbd71" xlink:to="loc_casy_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriod_0e96f8ea-f4a9-4b4a-982a-48edbf1d6003" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_875e0207-8b22-4eaf-9036-5f121a3c7464" 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_cda71596-28f9-41be-b9c5-eca17598170a" 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_669f8bc9-0893-4b05-8107-2d1b5c8407c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cda71596-28f9-41be-b9c5-eca17598170a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ca3bf300-a475-4175-9bf2-db5383836571" 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_cda71596-28f9-41be-b9c5-eca17598170a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ca3bf300-a475-4175-9bf2-db5383836571" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1acb22f0-c40c-4b1b-924d-bf0af180a77d" 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_cda71596-28f9-41be-b9c5-eca17598170a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1acb22f0-c40c-4b1b-924d-bf0af180a77d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_3883bb6a-c9ce-420f-b39c-2cb9fdec5acc" 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_cda71596-28f9-41be-b9c5-eca17598170a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_3883bb6a-c9ce-420f-b39c-2cb9fdec5acc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_232facc4-b413-4f9d-81cd-3ae797ea1ac8" 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_cda71596-28f9-41be-b9c5-eca17598170a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_232facc4-b413-4f9d-81cd-3ae797ea1ac8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriodWeightedAverageGrantDateFairValue_3c7781ad-6c1a-40d8-b33d-1486574696a7" xlink:href="casy-20240430.xsd#casy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_cda71596-28f9-41be-b9c5-eca17598170a" xlink:to="loc_casy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustedInPeriodWeightedAverageGrantDateFairValue_3c7781ad-6c1a-40d8-b33d-1486574696a7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_42b77f09-8251-45f6-9549-50ff593d7a8e" 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-20240430.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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" 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_54d07273-00d4-4714-8c57-323a1bf59ef9" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_54d07273-00d4-4714-8c57-323a1bf59ef9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_61d60685-8b23-4427-8bb6-b9d9baa6c3d6" 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_54d07273-00d4-4714-8c57-323a1bf59ef9" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_61d60685-8b23-4427-8bb6-b9d9baa6c3d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_61d60685-8b23-4427-8bb6-b9d9baa6c3d6_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_61d60685-8b23-4427-8bb6-b9d9baa6c3d6" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_61d60685-8b23-4427-8bb6-b9d9baa6c3d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_17acc7e7-9446-4b4e-a260-62e689d96a19" 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_61d60685-8b23-4427-8bb6-b9d9baa6c3d6" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_17acc7e7-9446-4b4e-a260-62e689d96a19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_7288eb25-8de2-4613-89eb-ea81de1a162e" 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_17acc7e7-9446-4b4e-a260-62e689d96a19" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_7288eb25-8de2-4613-89eb-ea81de1a162e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_19b07b12-e783-49e3-94a1-3566ae1bf9de" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_OperatingLossCarryforwards_19b07b12-e783-49e3-94a1-3566ae1bf9de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_28fa10fc-0e54-4f73-b06e-6a3855ff6c4b" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_28fa10fc-0e54-4f73-b06e-6a3855ff6c4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_2479199d-bf26-47f1-bfbc-04229746942b" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_2479199d-bf26-47f1-bfbc-04229746942b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_dc33ccad-1031-49b5-8ce1-fad8b517446a" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_dc33ccad-1031-49b5-8ce1-fad8b517446a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_412d45b7-1917-4629-a8ae-7e7a73059354" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_412d45b7-1917-4629-a8ae-7e7a73059354" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_cf20cee7-280a-4f0f-a627-b896fd43695b" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_cf20cee7-280a-4f0f-a627-b896fd43695b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_2ae70ce2-eaa5-4e82-9b2d-e97213c5cbf3" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_2ae70ce2-eaa5-4e82-9b2d-e97213c5cbf3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_f3d8deaf-329b-4791-8a41-2d0380010b5a" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_f3d8deaf-329b-4791-8a41-2d0380010b5a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_2574a01f-ea14-46f0-96b1-a2ac10826af8" 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_0cd64f41-56ed-4e43-a5d6-93b9b5b584b3" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_2574a01f-ea14-46f0-96b1-a2ac10826af8" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="casy-20240430.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_0e57dfb7-26b4-4690-8116-83d67f35a449" 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_11495ff0-225b-41fd-a9e8-df8e4a5c5e3b" 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_0e57dfb7-26b4-4690-8116-83d67f35a449" xlink:to="loc_us-gaap_OtherCommitmentsTable_11495ff0-225b-41fd-a9e8-df8e4a5c5e3b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_9c5a80bc-fb9e-498b-ab30-b524d89ccb3b" 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_11495ff0-225b-41fd-a9e8-df8e4a5c5e3b" xlink:to="loc_srt_CounterpartyNameAxis_9c5a80bc-fb9e-498b-ab30-b524d89ccb3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_9c5a80bc-fb9e-498b-ab30-b524d89ccb3b_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_9c5a80bc-fb9e-498b-ab30-b524d89ccb3b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_9c5a80bc-fb9e-498b-ab30-b524d89ccb3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_519d7781-641b-4632-8414-f153f2a1e575" 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_9c5a80bc-fb9e-498b-ab30-b524d89ccb3b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_519d7781-641b-4632-8414-f153f2a1e575" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_CityOfJoplinMissouriMember_1ae8a547-94df-4990-afbd-66b963361666" xlink:href="casy-20240430.xsd#casy_CityOfJoplinMissouriMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_519d7781-641b-4632-8414-f153f2a1e575" xlink:to="loc_casy_CityOfJoplinMissouriMember_1ae8a547-94df-4990-afbd-66b963361666" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_SaleLeasebackTransactionMaximumTaxableExemptBondsAvailable_c0a4a493-5f4a-44f5-bf6d-e10f55b83aef" xlink:href="casy-20240430.xsd#casy_SaleLeasebackTransactionMaximumTaxableExemptBondsAvailable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_0e57dfb7-26b4-4690-8116-83d67f35a449" xlink:to="loc_casy_SaleLeasebackTransactionMaximumTaxableExemptBondsAvailable_c0a4a493-5f4a-44f5-bf6d-e10f55b83aef" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/BenefitPlansDetails" xlink:type="simple" xlink:href="casy-20240430.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_264ef055-b561-48e9-989d-96b08c7d9865" 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_ccbd6e5f-4571-4782-9132-b31c2fa5120a" 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_264ef055-b561-48e9-989d-96b08c7d9865" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ccbd6e5f-4571-4782-9132-b31c2fa5120a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_237bd74b-ca20-4961-beb1-ad0eb3669df4" 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_ccbd6e5f-4571-4782-9132-b31c2fa5120a" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_237bd74b-ca20-4961-beb1-ad0eb3669df4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_237bd74b-ca20-4961-beb1-ad0eb3669df4_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_237bd74b-ca20-4961-beb1-ad0eb3669df4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_237bd74b-ca20-4961-beb1-ad0eb3669df4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_f720983c-23fc-4e19-8edc-3253f6406851" 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_237bd74b-ca20-4961-beb1-ad0eb3669df4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_f720983c-23fc-4e19-8edc-3253f6406851" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_cb2ccdda-ea4b-4b7c-a704-4ecb7529d784" 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_f720983c-23fc-4e19-8edc-3253f6406851" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_cb2ccdda-ea4b-4b7c-a704-4ecb7529d784" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_03d25e20-8e77-4811-b022-496965884c54" 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_264ef055-b561-48e9-989d-96b08c7d9865" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_03d25e20-8e77-4811-b022-496965884c54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_0a13c44a-014e-40b0-bc70-f2c812bf8b32" 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_264ef055-b561-48e9-989d-96b08c7d9865" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_0a13c44a-014e-40b0-bc70-f2c812bf8b32" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.caseys.com/role/ContingenciesDetails" xlink:type="simple" xlink:href="casy-20240430.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_f84905bf-3a4d-416a-99c3-8395d4c757d5" 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_449c2d93-6dbc-466b-b311-19306e2fdf76" 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_f84905bf-3a4d-416a-99c3-8395d4c757d5" xlink:to="loc_us-gaap_LossContingenciesTable_449c2d93-6dbc-466b-b311-19306e2fdf76" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_4d619d50-8996-452a-91f4-7198165ebaa1" 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_449c2d93-6dbc-466b-b311-19306e2fdf76" xlink:to="loc_srt_ProductOrServiceAxis_4d619d50-8996-452a-91f4-7198165ebaa1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_4d619d50-8996-452a-91f4-7198165ebaa1_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_4d619d50-8996-452a-91f4-7198165ebaa1" xlink:to="loc_srt_ProductsAndServicesDomain_4d619d50-8996-452a-91f4-7198165ebaa1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_08c42b53-19d3-49e3-a4d1-7742f2a68153" 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_4d619d50-8996-452a-91f4-7198165ebaa1" xlink:to="loc_srt_ProductsAndServicesDomain_08c42b53-19d3-49e3-a4d1-7742f2a68153" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_GeneralLiabilityAndAutoLiabilityInsuranceMember_d837d664-9fb1-462c-97b0-d150d33aa818" xlink:href="casy-20240430.xsd#casy_GeneralLiabilityAndAutoLiabilityInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c42b53-19d3-49e3-a4d1-7742f2a68153" xlink:to="loc_casy_GeneralLiabilityAndAutoLiabilityInsuranceMember_d837d664-9fb1-462c-97b0-d150d33aa818" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WorkersCompensationInsuranceMember_b6a75fe3-eb58-405c-a3a6-2538d4d4e32f" 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_08c42b53-19d3-49e3-a4d1-7742f2a68153" xlink:to="loc_us-gaap_WorkersCompensationInsuranceMember_b6a75fe3-eb58-405c-a3a6-2538d4d4e32f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_3d53fef0-bc50-4ba0-b7e8-7a5761bb467d" 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_449c2d93-6dbc-466b-b311-19306e2fdf76" xlink:to="loc_us-gaap_LitigationStatusAxis_3d53fef0-bc50-4ba0-b7e8-7a5761bb467d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_3d53fef0-bc50-4ba0-b7e8-7a5761bb467d_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_3d53fef0-bc50-4ba0-b7e8-7a5761bb467d" xlink:to="loc_us-gaap_LitigationStatusDomain_3d53fef0-bc50-4ba0-b7e8-7a5761bb467d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_1ef51475-7837-4ad8-9ed0-6e4539967ec5" 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_3d53fef0-bc50-4ba0-b7e8-7a5761bb467d" xlink:to="loc_us-gaap_LitigationStatusDomain_1ef51475-7837-4ad8-9ed0-6e4539967ec5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_3d6dcf53-5198-4451-9548-b071d93e1986" 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_1ef51475-7837-4ad8-9ed0-6e4539967ec5" xlink:to="loc_us-gaap_PendingLitigationMember_3d6dcf53-5198-4451-9548-b071d93e1986" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_216c9f5c-c5ba-4f35-a4fc-826788a0aeb6" 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_449c2d93-6dbc-466b-b311-19306e2fdf76" xlink:to="loc_srt_LitigationCaseAxis_216c9f5c-c5ba-4f35-a4fc-826788a0aeb6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_216c9f5c-c5ba-4f35-a4fc-826788a0aeb6_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_216c9f5c-c5ba-4f35-a4fc-826788a0aeb6" xlink:to="loc_srt_LitigationCaseTypeDomain_216c9f5c-c5ba-4f35-a4fc-826788a0aeb6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_3d96f94a-1674-41fc-90d7-b2ee3e9879c4" 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_216c9f5c-c5ba-4f35-a4fc-826788a0aeb6" xlink:to="loc_srt_LitigationCaseTypeDomain_3d96f94a-1674-41fc-90d7-b2ee3e9879c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_McColleyVCaseysGeneralStoresIncMember_87d03ab7-cdd2-4a2b-af01-2dc058cf16d0" xlink:href="casy-20240430.xsd#casy_McColleyVCaseysGeneralStoresIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_3d96f94a-1674-41fc-90d7-b2ee3e9879c4" xlink:to="loc_casy_McColleyVCaseysGeneralStoresIncMember_87d03ab7-cdd2-4a2b-af01-2dc058cf16d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfPlaintiffs_65a026d2-df7e-4032-a189-bb8a234e3d3b" 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_f84905bf-3a4d-416a-99c3-8395d4c757d5" xlink:to="loc_us-gaap_LossContingencyNumberOfPlaintiffs_65a026d2-df7e-4032-a189-bb8a234e3d3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_673f9153-cc25-42b7-a4ce-71723d388a91" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationSettlementAmountAwardedFromOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_f84905bf-3a4d-416a-99c3-8395d4c757d5" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_673f9153-cc25-42b7-a4ce-71723d388a91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_casy_AnnualStopLossLimit_a3956ee7-dd92-48f7-b677-ebc9cc606a58" xlink:href="casy-20240430.xsd#casy_AnnualStopLossLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_f84905bf-3a4d-416a-99c3-8395d4c757d5" xlink:to="loc_casy_AnnualStopLossLimit_a3956ee7-dd92-48f7-b677-ebc9cc606a58" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/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="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
