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Definitions of key:

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:   a lever that actuates a mechanism when depressed
noun:   pitch of the voice
Example: "He spoke in a low key"

noun:   something crucial for explaining
Example: "The key to development is economic integration"

noun:   a generic term for any device whose possession entitles the holder to a means of access
Example: "A safe-deposit box usually requires two keys to open it"

noun:   a list of words or phrases that explain symbols or abbreviations
noun:   a list of answers to a test
Example: "Some students had stolen the key to the final exam"

noun:   any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music
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
Example: "He hit a jump shot from the top of the key"

noun:   a coral reef off the southern coast of Florida
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)
noun:   a kilogram of a narcotic drug
Example: "They were carrying two keys of heroin"

noun:   the central building block at the top of an arch or vault
noun:   mechanical device used to wind another device that is driven by a spring (as a clock)
noun:   a winged often one-seed indehiscent fruit as of the ash or elm or maple
verb:   provide with a key
Example: "We were keyed after the locks were changed in the building"

verb:   harmonize with or adjust to
Example: "Key one's actions to the voters' prevailing attitude"

verb:   regulate the musical pitch of
verb:   vandalize a car by scratching the sides with a key
Example: "His new Mercedes was keyed last night in the parking lot"

verb:   identify as in botany or biology, for example
adjective:   effective; producing a desired effect
adjective:   serving as an essential component
name:  A surname (common: 1 in 6666 families; popularity rank in the U.S.: #796)

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Alternative Terms
quay cay kilogram formula route secret ticket means-similar-words capital cardinal chiefdom first foremost leading main major number-ones paramount premier primary prime principal top important-unimportant central pivotal key-up in-key under-lock-and-key pitch harmony tonality church-mode thomas-hardy bible-divination nosebleed scale-in-music modulation musical-notation atonality octave piano tonic torque developed-country world-the-price-of-love keyring key-fob keychain bangalore lock-device power-door-locks saab-9-5 logo automobile ignition-system glove-compartment trunk-automobile valet-parking steering-wheel gear-stick saab-automobile remote-keyless-system lr3-key-002-jpg mercedes-benz infrared land-rover volkswagen pin-tumbler-lock 1898 warded-lock tubular-pin-tumbler-lock lock-picking access-control identity-document keycard-lock barcode magnetic-card chip-card integrated-circuit radio-frequency-identification privacy surveillance electronic-lock biometrics fingerprint tor-s-rnes advanced-key password passphrase personal-identification-number personal-unblocking-code key-cryptography keyway s-key-2 backspace-key key-shopping greek-key sort-field copoclephily