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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.

The usual type of key is a small metal object that you insert into a narrow opening and turn.

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

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