The Collaborative International Dictionary of English v.0.48:

Closet \Clos"et\, n. [OF. closet little inclosure, dim. of clos.
   See Close an inclosure.]
   1. A small room or apartment for retirement; a room for
      privacy.
      [1913 Webster]

            A chair-lumbered closet, just twelve feet by nine.
                                                  --Goldsmith.
      [1913 Webster]

            When thou prayest, enter into thy closet. --Matt.
                                                  vi. 6.
      [1913 Webster]

   2. A small apartment, or recess in the side of a room, for
      household utensils, clothing, etc. --Dryden.
      [1913 Webster]

   Closet sin, sin commited in privacy. --Bp. Hall.
      [1913 Webster]