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KEY Definition & Meaning - Merriam-Webster
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 | English meaning - Cambridge Dictionary
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.
key noun - Definition, pictures, pronunciation and usage notes
Definition of key noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
KEY definition in American English | Collins English Dictionary
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. They put the key in the door and entered.
Key - definition of key by The Free Dictionary
Of crucial importance; significant: key decisions; the key element of the thesis.
KEY Definition & Meaning | Dictionary.com
KEY definition: a reef or low island; cay. See examples of key used in a sentence.
key - Wiktionary, the free dictionary
Dec 22, 2025 · key (plural keys) (countable) An object designed to open and close a lock. quotations
Key Definition & Meaning | YourDictionary
Something regarded as like a key in opening or closing a way, revealing or concealing, etc.
Key Definition & Meaning | Britannica Dictionary
The usual type of key is a small metal object that you insert into a narrow opening and turn.