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Lynchpin
noun 1.A central cohesive source of support and stability. Synonyms: anchor, backbone, keystone, linchpin, mainstay. "The keystone of campaign reform was the ban on soft money" , "He is the linchpin of this firm" 2.Pin inserted through an axletree to hold a wheel on. Synonym: linchpin.
WordNet 3.0 © 2010 Princeton University
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