undress

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To remove the clothing of; disrobe.
• intransitive verb To remove the bandages from (a wound, for example).
• intransitive verb To take off one's clothing.
• noun Informal attire or uniform.
• noun Nakedness or partial nakedness.
• noun Partial but incomplete dress.

from The Century Dictionary.

• noun Ordinary dress, as opposed to full dress or uniform, regarded as “dress” in a special sense; a loose negligent dress.
• Pertaining to ordinary attire; hence, informal; unostentatious; simple: as, an undress uniform.
• To take off the clothes of; strip: as, to undress a child.
• To divest of ornaments or elegant attire; disrobe. To take the dressing, bandages, or covering from, as a wound.
• To take off one's dress or clothes.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To divest of clothes; to strip.
• transitive verb To divest of ornaments to disrobe.
• transitive verb (Med.) To take the dressing, or covering, from.
• noun A loose, negligent dress; ordinary dress, as distinguished from full dress.
• noun (Mil. & Naval) An authorized habitual dress of officers and soldiers, but not full-dress uniform.
• noun (Mil.) a substitute for dress parade, allowed in bad weather, the companies forming without arms, and the ceremony being shortened.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the state of having little or no clothes on

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb get undressed
• verb remove (someone's or one's own) clothes
• noun partial or complete nakedness