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Cross Word - The Definition Game
definition of [1] #1 keystone n. [anchor, mainstay, backbone, linchpin, lynchpin] 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". wn [2] #2 keystone n. [key, headstone] the central building block at the top of an arch or vault. wn
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