keystone

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• February 10. 2013 from wordnet.princeton.edu

  keystone — noun — english

  a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"

• February 29. 2016 from wordnet.princeton.edu

  keystone — noun — english

  the central building block at the top of an arch or vault