a chest, drawer, compartment, closet, or the like, that may be locked, esp. one at a gymnasium, school, etc. for storage and safekeeping of clothing and valuables.

Nautical . a chest or compartment in which to stow things.

a refrigerated compartment, as in a locker plant, that may be rented for storing frozen foods.

a person or thing that locks.

noun

cabinet , chest , closet , trunk