Definitions from Wiktionary ( )

▸ noun:  An object designed to open and close a lock.
▸ noun:  An object designed to fit between two other objects (such as a shaft and a wheel) in a mechanism and maintain their relative orientation.
▸ noun:  A crucial step or requirement.
▸ noun:  A guide explaining the symbols or terminology of a map or chart; a legend.
▸ noun:  A guide to the correct answers of a worksheet or test.
▸ noun:  (computing) One of several small, usually square buttons on a typewriter or computer keyboard, mostly corresponding to text characters.
▸ noun:  (music)
▸ noun:  In musical instruments, one of the valve levers used to select notes, such as a lever opening a hole on a woodwind.
▸ noun:  In instruments with a keyboard such as an organ or piano, one of the levers, or especially the exposed front end of it, which are depressed to cause a particular sound or note to be produced.
▸ noun:  (music) A scale or group of pitches constituting the basis of a musical composition.
▸ noun:  The lowest note of a scale; keynote.
▸ noun:  In musical theory, the total melodic and harmonic relations, which exist between the tones of an ideal scale, major or minor; tonality.
▸ noun:  In musical theory and notation, the tonality centering in a given tone, or the several tones taken collectively, of a given scale, major or minor.
▸ noun:  In musical notation, a sign at the head of a staff indicating the musical key.
▸ noun:  (figurative) The general pitch or tone of a sentence or utterance.
▸ noun:  (advertising) A modification of an advertisement so as to target a particular group or demographic.
▸ noun:  (botany) An indehiscent, one-seeded fruit furnished with a wing, such as the fruit of the ash and maple; a samara.
▸ noun:  (historical) A manual electrical switching device primarily used for the transmission of Morse code.
▸ noun:  (cryptography) A piece of information (e.g., a password or passphrase) used to encode or decode a message or messages.
▸ noun:  (Internet) A password restricting access to an IRC channel.
▸ noun:  (databases) In a relational database, a field used as an index into another table (not necessarily unique).
▸ noun:  (computing) A value that uniquely identifies an entry in a container.
▸ noun:  (basketball) The free-throw lane together with the circle surrounding the free-throw line, the free-throw lane having formerly been narrower, giving the area the shape of a skeleton key hole.
▸ noun:  (biology) A series of logically organized groups of discriminating information which aims to allow the user to correctly identify a taxon.
▸ noun:  (architecture) A piece of wood used as a wedge.
▸ noun:  (architecture) The last board of a floor when laid down.
▸ noun:  (masonry) A keystone.
▸ noun:  That part of the plastering which is forced through between the laths and holds the rest in place.
▸ noun:  (rail transport) A wooden support for a rail on the bullhead rail system.
▸ noun:  The degree of roughness, or retention ability of a surface to have applied a liquid such as paint, or glue.
▸ noun:  (cartomancy) The thirty-third card of the Lenormand deck.
▸ noun:  (print and film) The black ink layer, especially in relation to the three color layers of cyan, magenta, and yellow. See also CMYK.
▸ noun:  (computer graphics, television) A color to be masked or made transparent.
▸ adjective:  Indispensable, supremely important.
▸ adjective:  Important, salient.
▸ verb:  To fit (a lock) with a key.
▸ verb:  To fit (pieces of a mechanical assembly) with a key to maintain the orientation between them.
▸ verb:  To mark or indicate with a symbol indicating membership in a class.
▸ verb:  (telegraphy and radio telegraphy) To depress (a telegraph key).
▸ verb:  (radio) To operate (the transmitter switch of a two-way radio).
▸ verb:  (computing) (more usually to key in) To enter (information) by typing on a keyboard or keypad.
▸ verb:  (colloquial) To vandalize (a car, etc.) by scratching with an implement such as a key.
▸ verb:  To link (as one might do with a key or legend).
▸ verb:  (intransitive, biology, chiefly taxonomy) To be identified as a certain taxon when using a key.
▸ verb:  (advertising, transitive) To modify (an advertisement) so as to target a particular group or demographic.
▸ verb:  To attune to; to set at; to pitch.
▸ verb:  To fasten or secure firmly; to fasten or tighten with keys or wedges.
▸ verb:  To prepare for plastering by adding the key (that part of the plastering which is forced through between the laths and holds the rest in place).
▸ verb:  To provide an arch with a keystone.
▸ noun:  One of a string of small islands.
▸ noun:  (slang) A kilogram, especially of a recreational drug.
▸ noun:  A surname.
▸ verb:  Clipping of chromakey. [(transitive) To modify an image in this way.]
▸ noun:  Alternative form of quay [(nautical) A stone or concrete structure on navigable water used for loading and unloading vessels; a wharf.]

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