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Keystone
noun 1.A central cohesive source of support and stability. Synonyms: anchor, backbone, linchpin, lynchpin, mainstay. "The keystone of campaign reform was the ban on soft money" , "He is the linchpin of this firm" 2.The central building block at the top of an arch or vault. Synonyms: headstone, key.
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WordNet 3.0 © 2010 Princeton University
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