A festival in honor of Bacchus, the Roman god of wine, characterized by revelry and excessive drinking. The ancient Romans celebrated the bacchanalia with great enthusiasm and indulgence.
A wild and drunken celebration or party. The college students' party turned into a bacchanalia, with music blaring and drinks flowing freely.
Plural of bacchanal: people who are engaged in drunken revelry. At dawn, the bacchanalia reeled through the streets, singing and laughing uproariously.