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.

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a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a …

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Lock, mechanical device for securing a door or receptacle so that it cannot be opened except by a key or by a series of manipulations that can be carried out only by a person knowing the secret …