Definition - key

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key
  1. a list of words or phrases that explain symbols or abbreviations
  2. a list of answers to a test; "some students had stolen the key to the final exam"
  3. any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music
  4. (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"
  5. a coral reef off the southern coast of Florida
  6. 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 `The Star-Spangled Banner' (1779-1843)
  7. a winged often one-seed indehiscent fruit as of the ash or elm or maple
  8. serving as an essential component; "a cardinal rule"; "the central cause of the problem"; "an example that was fundamen