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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: a small metal instrument specially cut to fit into a lock and move its bolt. See examples of key used in a sentence.

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

She fumbled around in her handbag, looking for her key. She suddenly remembered (that) her keys were in her other bag. Please hand in your keys at reception on your departure from the hotel.

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.

Definition of key noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

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 …

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