Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A key that opens every one of a given set of locks.

from The Century Dictionary.

  • noun A key which opens (masters) many locks so differently constructed that the key proper to each will open none of the others.
  • noun Figuratively, a general clue to lead out of many difficulties; a guide to the solution of many questions or doubts.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A key designed to open a set of several locks; a passkey

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun key that secures entrance everywhere

Etymologies

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