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]