The Collaborative International Dictionary of English v.0.48:

Debauchery \De*bauch"er*y\, n.; pl. Debaucheries.
   1. Corruption of fidelity; seduction from virtue, duty, or
      allegiance.
      [1913 Webster]

            The republic of Paris will endeavor to complete the
            debauchery of the army.               --Burke.
      [1913 Webster]

   2. Excessive indulgence of the appetites; especially,
      excessive indulgence of lust; intemperance; sensuality;
      habitual lewdness.
      [1913 Webster]

            Oppose . . . debauchery by temperance. --Sprat.
      [1913 Webster]

WordNet (r) 3.0 (2006):

debauchery
    n 1: a wild gathering involving excessive drinking and
         promiscuity [syn: orgy, debauch, debauchery,
         saturnalia, riot, bacchanal, bacchanalia, drunken
         revelry]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "debauchery":
   carousal, carouse, debauch, debauchment, dissipation,
   dissoluteness, fastness, free living, gallantry, high living,
   killing pace, libertinage, libertinism, license, licentiousness,
   orgy, profligacy, rakishness, riotous living, saturnalia,
   unbridledness, venery, wenching, whoring, wildness