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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.

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.

Of crucial importance; significant: key decisions; the key element of the thesis.

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.

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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.