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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.

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.

Discover the word "KEY" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource.

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

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a position or condition which affords entrance, control, pr possession, etc.; as, the key of a line of defense; the key of a country; the key of a political situation.

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