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.

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 …

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Lock definition: A device operated by a key, combination, or keycard and used, as on a door, for holding, closing, or securing.

Enter a code to operate electromagnetic locks, electric door strikes, and other access controls. Shackle objects together, such as a door and its frame, to prevent theft or unauthorized entry. Secure …