Definition - key

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key
  1. something crucial for explaining; "the key to development is economic integration"
  2. 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"
  3. a list of words or phrases that explain symbols or abbreviations
  4. a list of answers to a test; "some students had stolen the key to the final exam"
  5. any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music
  6. (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"
  7. a coral reef off the southern coast of Florida
  8. United States lawyer and poet who wrote a poem after witnessing the British attack on Baltimore during the War of 1812; the poem was later set to music and entitled