[noun] metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated
[noun] something crucial for explaining; "the key to development is economic integration"
[noun] pitch of the voice; "he spoke in a low key"
[noun] any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music Synonyms:tonality
[noun] a kilogram of a narcotic drug; "they were carrying two keys of heroin"
[noun] a winged often one-seed indehiscent fruit as of the ash or elm or maple Synonyms:samara, fruit
[noun] 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) Synonyms:Key, Francis Scott Key
[noun] a coral reef off the southern coast of Florida Synonyms:cay, Florida s
[noun] (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" Synonyms:paint
[noun] a list of answers to a test; "some students had stolen the key to the final exam"
[noun] a list of words or phrases that explain symbols or abbreviations
[noun] 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"
[noun] mechanical device used to wind another device that is driven by a spring (as a clock) Synonyms:winder
[noun] the central building block at the top of an arch or vault Synonyms:stone, headstone
[noun] a lever that actuates a mechanism when depressed
[verb] provide with a key; "We were keyed after the locks were changed in the building"
[verb] vandalize a car by scratching the sides with a key; "His new Mercedes was keyed last night in the parking lot"
[verb] regulate the musical pitch of
[verb] harmonize with or adjust to; "key one's actions to the voters' prevailing attitude"
[adjective] serving as an essential component; "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure" Synonyms:cardinal, central, fundamental, primal
[adjective] effective; producing a desired effect; "the operative word" Synonyms:operative