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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.

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a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a …

Master Lock is recognized around the world as the authentic, enduring name in locks, combination padlocks and security products. Learn more about our extensive assortment of …

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Enter a code to operate electromagnetic locks, electric door strikes, and other access controls. Replace or cut new keys for padlocks, enclosures, cabinet doors, and locksets.