Definition - key

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key
  1. a kilogram of a narcotic drug; "they were carrying two keys of heroin"
  2. serving as an essential component;
  3. metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated
  4. a lever (as in a keyboard) that actuates a mechanism when depressed
  5. the central building block at the top of an arch or vault
  6. mechanical device used to wind another device that is driven by a spring (as a clock)
  7. pitch of the voice; "he spoke in a low key"
  8. something crucial for explaining; "the key to development is economic integration"
  9. 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"
  10. harmonize with or adjust to; "key one's actions to the voters' prevailing attitude"
  11. a list of words or phrases that explain symbols or abbreviations
  12. regulate the musical pitch of

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