‖n. pl. [ L., fr. Gr. &unr_;. ] (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. [ Webster 1913 Suppl. ]

a. Of or pertaining to Dionysus or to the Dionysia; Bacchic; as, a Dionysiac festival; the Dionysiac theater at Athens. [ Webster 1913 Suppl. ]

a. Relating to Dionysius, a monk of the 6th century; as, the Dionysian, or Christian, era. [ 1913 Webster ]

Dionysian period, a period of 532 years, depending on the cycle of the sun, or 28 years, and the cycle of the moon, or 19 years; -- sometimes called the Greek paschal cycle, or Victorian period. [ 1913 Webster ]