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Definition of "key" [key]

  • A notched and grooved, usually metal implement that is turned to open or close a lock. (noun)
  • A similar device used for opening or winding: the key of a clock; a can that has a key attached. (noun)
  • A means of access, control, or possession. (noun)
  • A vital, crucial element. (noun)
  • A set of answers to a test. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "key" in a sentence
  • "_The key to the proper control of China and the building-up of the new Republican State is the railway key_ ...."
  • "My eye caught sight of the great key, _Pakenham's key_, lying there on the table."
  • "Say that I made bold to assert that you did not possess the key that would unlock the sacred places of her heart; and you may add further, that I say the _key is held by another_."