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Definitions of keystone
  1. noun
    a central cohesive source of support and stability
    "the keystone of campaign reform was the ban on soft money"
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  2. noun
    the central building block at the top of an arch or vault

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Definition that contains keystone
  • coign the keystone of an arch
  • gothic arch a pointed arch; usually has a joint (instead of a keystone) at the apex
  • coigne the keystone of an arch
  • quoin the keystone of an arch
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