The Collaborative International Dictionary of English v.0.48:

Locker \Lock"er\, n.
   1. One who, or that which, locks.
      [1913 Webster]

   2. A drawer, cupboard, compartment, or chest, esp. one in a
      ship, that may be closed with a lock.
      [1913 Webster]

   Chain locker (Naut.), a compartment in the hold of a
      vessel, for holding the chain cables.

   Davy Jones's locker, or Davy's locker. See Davy Jones.


   Shot locker, a compartment where shot are deposited.
      --Totten.
      [1913 Webster]

WordNet (r) 3.0 (2006):

locker
    n 1: a storage compartment for clothes and valuables; usually it
         has a lock [syn: cabinet, locker, storage locker]
    2: a fastener that locks or closes
    3: a trunk for storing personal possessions; usually kept at the
       foot of a bed (as in a barracks) [syn: footlocker,
       locker]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "locker":
   Fort Knox, archives, armory, arsenal, attic, bank, basement, bay,
   bin, bonded warehouse, bookcase, box, bunker, bursary, buttery,
   cargo dock, cash register, cashbox, cellar, chest, closet, coffer,
   coin box, cold storage, conservatory, coolerman, coolhouse, crate,
   crib, cupboard, depository, depot, dock, drawer, dump, exchequer,
   fisc, freezer locker, frigidarium, frozen-food locker, glory hole,
   godown, gold depository, hold, hutch, library, locker plant,
   lumber room, lumberyard, magasin, magazine, money chest,
   penny bank, piggy bank, pork barrel, public crib, public till,
   public treasury, public trough, rack, repertory, repository,
   reservoir, rick, safe, safe-deposit box, shelf, stack, stack room,
   stock room, storage, store, storehouse, storeroom, strong room,
   strongbox, subtreasury, supply base, supply depot, tank, till,
   treasure house, treasure room, treasure-house, treasury, vat,
   vault, warehouse, wine cellar