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The meaning of LOCK is a fastening (as for a door) operated by a key or a combination. How to use lock in a sentence.

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LOCK definition: 1. a device that prevents something such as a door from being opened and can only be opened with a…. Learn more.

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Define lock. lock synonyms, lock pronunciation, lock translation, English dictionary definition of lock. n. 1. A device operated by a key, combination, or keycard and used, as on a door, for holding, closing, or …

LOCK definition: a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, …

The lock on something such as a door or a drawer is the device which is used to keep it shut and prevent other people from opening it. Locks are opened with a key.