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Noun: linchpin  'linch,pin
  1. A central cohesive source of support and stability
    "he is the linchpin of this firm";
    - anchor, mainstay, keystone, backbone, lynchpin
  2. Pin inserted through an axletree to hold a wheel on
    - lynchpin

Derived forms: linchpins

Type of: pin, support

Encyclopedia: Linchpin