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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.

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.

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.

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

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Key definition: a small metal instrument specially cut to fit into a lock and move its bolt.. See examples of KEY used in a sentence.

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

Synonyms for KEY: main, primary, greatest, highest, predominant, dominant, foremost, big; Antonyms of KEY: last, least, minor, unimportant, trivial, insignificant, secondary, slight