bacchanalian Syllabification: (bac·cha·na·li·an)Pronunciation: /ˌbäkəˈnālyən, -ˈnālēən, ˌbakə-/Definition of bacchanalian adjective characterized by or given to drunken revelry; riotously drunken:a bacchanalian orgybacchanalian in other Oxford dictionaries Definition of bacchanalian in the British & World English dictionary