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key

key - noun

  1. A means or method of entering into or achieving something desirable: formula, route, secret. Informal ticket. See means.

key - adjective

  1. Most important, influential, or significant: capital, cardinal, chief, first, foremost, leading, main, major, number one, paramount, premier, primary, prime, principal, top. See important.
  2. Dominant in importance or influence: central, pivotal. See important.