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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.

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.

KEY definition: a reef or low island; cay. See examples of key used in a sentence.

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