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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.

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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.

The Key, a 1974 children's book by Sheila K. McCullagh, part of the Tim and the Hidden People series The Key: A Startling Enquiry into the Riddle of Man's Past, a 1969 book by John Philip Cohane

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

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

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.