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3 days ago · 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.

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.

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

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

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

A key is used by placing the key into the slot of the thing you want to unlock. A key that can open more than one lock (if each lock also has its own key) is called a master key or skeleton key.