Source : Webster's Revised Unabridged Dictionary (1913)

Dionysia \Di`o*ny"si*a\, n. pl. [L., fr. Gr. ?.] (Class. Antiq.)
   Any of the festivals held in honor of the Olympian god
   Dionysus. They correspond to the Roman Bacchanalia; the
   greater Dionysia were held at Athens in March or April, and
   were celebrated with elaborate performances of both tragedies
   and comedies.

Source : WordNet®

Dionysia
     n : an orgiastic festival in ancient Greece in honor of Dionysus
         (= Bacchus) [syn: {Bacchanalia}]