Definition - key

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key
  1. pitch of the voice; "he spoke in a low key"
  2. something crucial for explaining; "the key to development is economic integration"
  3. 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"
  4. a list of words or phrases that explain symbols or abbreviations
  5. a list of answers to a test; "some students had stolen the key to the final exam"
  6. any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music
  7. harmonize with or adjust to; "key one's actions to the voters' prevailing attitude"
  8. (basketball) a space (including the foul line) in front of the basket at each end of a basketball court; usually painted a different color from the rest of the court; "he hit a jump shot from the top of the key"; "he dominates play in the paint"
  9. regulate the musical pitch of
  10. a coral reef off the southern coas