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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.

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.

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

Definition of key noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

adjective essential; central; important. a key person in the company; key industries.

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

A key is a piece of metal that fits inside a lock and turns to open it. You might have a key ring with a house key, a car key, and maybe several more keys.

any of various devices resembling or functioning as a key: The key of an old-fashioned clock is used to wind it up. something that provides a means to achieve, become skilled at, or …