Source : Webster's Revised Unabridged Dictionary (1913)

Undress \Un*dress"\, v. t. [1st pref. un- + dress.]
   1. To divest of clothes; to strip.

   2. To divest of ornaments to disrobe.

   3. (Med.) To take the dressing, or covering, from; as, to
      undress a wound.

Undress \Un"dress\, n.
   1. A loose, negligent dress; ordinary dress, as distinguished
      from full dress.

   2. (Mil. & Naval) An authorized habitual dress of officers
      and soldiers, but not full-dress uniform.

   {Undress parade} (Mil.), a substitute for dress parade,
      allowed in bad weather, the companies forming without
      arms, and the ceremony being shortened.

Source : WordNet®

undress
     n : partial or complete nakedness; "a state of undress"
     v 1: get undressed; "please don't undress in front of
          everybody!"; "She strips in front of strangers every
          night for a living" [syn: {discase}, {uncase}, {unclothe},
           {strip}, {strip down}, {disrobe}, {peel}] [ant: {dress},
           {dress}]
     2: remove (someone's or one's own) clothes; "The nurse quickly
        undressed the accident victim"; "She divested herself of
        her outdoor clothes"; "He disinvested himself of his
        garments" [syn: {strip}, {divest}, {disinvest}]