Source : Webster's Revised Unabridged Dictionary (1913)

Bacchanal \Bac"cha*nal\, a. [L. Bacchanalis. See {Bacchanalia}.]
   1. Relating to Bacchus or his festival.

   2. Engaged in drunken revels; drunken and riotous or noisy.

Bacchanal \Bac"cha*nal\, n.
   1. A devotee of Bacchus; one who indulges in drunken revels;
      one who is noisy and riotous when intoxicated; a carouser.
      ``Tipsy bacchanals.'' --Shak.

   2. pl. The festival of Bacchus; the bacchanalia.

   3. Drunken revelry; an orgy.

   4. A song or dance in honor of Bacchus.

Source : WordNet®

bacchanal
     adj : used of riotously drunken merrymaking; "a night of
           bacchanalian revelry"; "carousing bands of drunken
           soldiers"; "orgiastic festivity" [syn: {bacchanalian},
           {bacchic}, {carousing}, {orgiastic}]

bacchanal
     n 1: someone who engages in drinking bouts [syn: {drunken reveler},
           {drunken reveller}, {bacchant}]
     2: a drunken reveller; a devotee of Bacchus [syn: {bacchant}]
     3: a wild gathering involving excessive drinking and
        promiscuity [syn: {orgy}, {debauch}, {debauchery}, {saturnalia},
         {riot}, {bacchanalia}, {drunken revelry}]