An object designed to fit between two other objects (such as a shaft and a wheel) in a mechanism and maintain the orientation between them.
A crucial step or requirement
the key to solving this problem
the key to winning this game
One of several small, usually square buttons on a typewriter or computer keyboard, most of which generally correspond to a particular letter of the alphabet, numeral, or special symbol
Press the Escape key.
One of a number of rectangular buttons on a piano or musical keyboard, each causing a particular sound or note to be produced.
A device used to transmit Morse code.
(cryptography) A piece of information (e.g. a passphrase) used to encode or decode a message.
(database) A field of a relation constrained to be unique
(database) A field in a record that is used as a search argument (not necessarily unique)
A scale of musical notes on which a composition is based
The key of B-flat major
(basketball)The free-throw lane together with the circle surrounding the freethrow line, the freethrow lane having formerly been narrower, giving the area the shape of a skeleton key hole.