Definition of linchpin

noun (n)

• a central cohesive source of support and stability (noun.cognition)

  Synonym: anchor, backbone, keystone, lynchpin, mainstay
  

  Example:
  He is the linchpin of this firm.
  

  source: wordnet30
• pin inserted through an axletree to hold a wheel on (noun.artifact)

  Synonym: lynchpin
  

  source: wordnet30
• A pin used to prevent the wheel of a vehicle from sliding off the axletree. (noun)

  source: webster1913

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