Etymology
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locker (n.)

"small chest that can be locked," late 14c., agent noun from Middle English lokken (see lock (v.)). Especially for individual use in companies of men, as on shipboard or in military regiments. As a characteristic of high school life, 20c. Earlier the word meant "a mechanism for locking" (early 14c.).

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Definitions of locker

locker (n.)
a storage compartment for clothes and valuables; usually it has a lock;
Synonyms: cabinet / storage locker
locker (n.)
a fastener that locks or closes;
locker (n.)
a trunk for storing personal possessions; usually kept at the foot of a bed (as in a barracks);
Synonyms: footlocker
From wordnet.princeton.edu