Real Dictionary

lock
countable noun: 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.
verb: If you lock something or someone in a place, room, or container, you put them there and fasten the lock.
verb: When you lock something such as a door, drawer, or case, you fasten it, usually with a key, so that other people cannot open it.

lock in American English 1
a mechanical device furnished with a bolt and, usually, a spring, for fastening a door, strongbox, etc. by means of a key or combination
noun: 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a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, dial, etc

lock in American English 2
a curl, tress, or ringlet of hair
noun: a tress, curl, or ringlet of hair

lock in Automotive Engineering 1
noun: The lock on a vehicle door is the device which is used to keep it shut and prevent other people from opening it. Locks are opened with a key.

lock in Automotive Engineering 2
noun: Lock is the angle of rotation of steered wheels about the steering axis.

lock in Automotive Engineering 3
noun: Lock is the maximum angle to which steered wheels can be turned.

lock in Automotive Engineering 4
verb: When you lock a vehicle door, you fasten it with a key so that other people cannot open it.

lock in British English 1
noun: a device fitted to a gate, door, drawer, lid, etc, to keep it firmly closed and often to prevent access by unauthorized persons
verb: to fasten (a door, gate, etc) or (of a door, etc) to become fastened with a lock, bolt, etc, so as to prevent entry or exit

lock in British English 2
noun: a strand, curl, or cluster of hair

lock in Hospitality
noun: 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.