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.

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

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

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