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The meaning of KEY is a usually metal instrument that is used to open a lock or to start or access a mechanism. How to use key in a sentence.

The Key, a 1974 children's book by Sheila K. McCullagh, part of the Tim and the Hidden People series The Key: A Startling Enquiry into the Riddle of Man's Past, a 1969 book by John Philip Cohane

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Of crucial importance; significant: key decisions; the key element of the thesis.

a position or condition which affords entrance, control, pr possession, etc.; as, the key of a line of defense; the key of a country; the key of a political situation.

KEY definition: 1. a piece of metal that has been cut into a special shape and is used for opening or closing a…. Learn more.

A key is a specially shaped piece of metal that you place in a lock and turn in order to open or lock a door, or to start or stop the engine of a vehicle. They put the key in the door and entered.

Something regarded as like a key in opening or closing a way, revealing or concealing, etc.

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