Definition: lynchpin

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Source: WordNet (r) 1.7 

lynchpin
     n 1: a central cohesive source of support and stability: "faith
          is his anchor"; "he is the linchpin of this firm" [syn:
          anchor, mainstay, backbone, linchpin]
     2: pin inserted through an axletree to hold a wheel on [syn: linchpin]