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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.

Common uses Key (cryptography), a piece of information needed to encode or decode a message Key (instrument), a component of a musical instrument Key (lock), a device used to operate a lock Key …

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.

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

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

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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 understand something …

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

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