Definition - key

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key
  1. the central building block at the top of an arch or vault
  2. regulate the musical pitch of
  3. mechanical device used to wind another device that is driven by a spring (as a clock)
  4. identify as in botany or biology, for example
  5. pitch of the voice; "he spoke in a low key"
  6. vandalize a car by scratching the sides with a key; "His new Mercedes was keyed last night in the parking lot"
  7. something crucial for explaining; "the key to development is economic integration"
  8. 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 to modern industrial structure"
  9. provide with a key; "We were keyed after the locks were changed in the building"
  10. 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"
  11. a list of word

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