Definition - key

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key
  1. a lever (as in a keyboard) that actuates a mechanism when depressed
  2. vandalize a car by scratching the sides with a key; "His new Mercedes was keyed last night in the parking lot"
  3. the central building block at the top of an arch or vault
  4. provide with a key; "We were keyed after the locks were changed in the building"
  5. mechanical device used to wind another device that is driven by a spring (as a clock)
  6. pitch of the voice; "he spoke in a low key"
  7. something crucial for explaining; "the key to development is economic integration"
  8. a generic term for any device whose possession entitles the holder to a means of access; "a safe-deposit box usually requires two keys to open it"
  9. a list of words or phrases that explain symbols or abbreviations
  10. serving as an essential component; "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental

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