Source : Webster's Revised Unabridged Dictionary (1913)

Orgy \Or"gy\, n.; pl. {Orgies}.
   A frantic revel; drunken revelry. See {Orgies}

Orgies \Or"gies\, n. pl.; sing. {Orgy}.

   Note: [The singular is rarely used.] [F. orgie, orgies, L.
         orgia, pl., Gr. ?; akin to ? work. See {Organ}, and
         {Work}.]
   1. A sacrifice accompanied by certain ceremonies in honor of
      some pagan deity; especially, the ceremonies observed by
      the Greeks and Romans in the worship of Dionysus, or
      Bacchus, which were characterized by wild and dissolute
      revelry.

            As when, with crowned cups, unto the Elian god,
            Those priests high orgies held.       --Drayton.

   2. Drunken revelry; a carouse. --B. Jonson. Tennyson.