Definition - key

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key
  1. 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)
  2. provide with a key; "We were keyed after the locks were changed in the building"
  3. a winged often one-seed indehiscent fruit as of the ash or elm or maple
  4. serving as an essential component;
  5. a kilogram of a narcotic drug; "they were carrying two keys of heroin"
  6. metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated
  7. a lever (as in a keyboard) that actuates a mechanism when depressed
  8. the central building block at the top of an arch or vault
  9. mechanical device used to wind another device that is driven by a spring (as a clock)
  10. pitch of the voice; "he spoke in a low key"
  11. something crucial for explaining; "the key to development is

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