key
  • noun a set of questions to enable something to be identified or classified
  • A crucial or indispensable element.
  • A device part, such as a wedge or pin, which is inserted into a slot or groove for locking, securing, tightening, guiding, or adjusting.
  • A button, lever, or handle which is depressed or pressed, to open or close a circuit, to actuate a mechanism, or the like. Also called switching key.
  • A button, such as that on a keyboard or keypad, which is depressed to provide an input or an action.
  • In databases, an identifier for one or more records or files.
  • In computer and communications security, a variable-length bit string which is utilized for encryption and decryption.

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