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English definition of “key”

key

noun [C] (LOCK)    /kiː/
A1 a piece of metal that has been cut into a special shape and is used for opening or closing a lock, starting a car engine, etc.: car/door keysLocks and locksmithing
(Definition of key noun (LOCK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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