1560s; see bacchanalia + -an. As a noun from 1610s.
"drunken revelry," 1630s, from the name of the Roman festival held in honor of Bacchus, from neuter plural of Latin bacchanalis (see bacchanal). A participant is a Bacchant (1690s), fem. Bacchante, from French. The plural of both is Bacchantes.