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 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.
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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
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