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.

Dec 20, 2025 · lock (plural locks) Something used for fastening, which can only be opened with a key or combination. quotations

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Building to shut in a place fastened by a lock or locks, as for security or restraint. Building to make fast or immovable by or as if by a lock: He locked the steering wheel on his car.

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a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, …

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 …