An orgiastic festival in ancient Greece in honor of Dionysus (= Bacchus)

Wikipedia Word definitions in Wikipedia
The Dionysia was a large festival in ancient Athens in honor of the god Dionysus , the central events of which were the theatrical performances of dramatic tragedies and, from 487 BC, comedies . It was the second-most important festival after the Panathenaia ...

Wiktionary Word definitions in Wiktionary
n. The orgiastic Ancient Greek festivals seasonally held in honor of Dionysus, which evolved into Greek comedy and tragedy.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...