adagio Syllabification: (a·da·gio)Pronunciation: /əˈdäjō, əˈdäZHēˌō/ MusicDefinition of adagio adjective & adverb (especially as a direction) in slow tempo. noun (also Adagio) (plural adagios) a movement or composition marked to be played adagio. Origin:Italian, from ad agio 'at ease'adagio in other Oxford dictionaries Definition of adagio in the British & World English dictionary