modalism Syllabification: (mod·al·ism)Pronunciation: /ˈmodlˌizəm/Definition of modalism noun 1 Theology the doctrine that the persons of the Trinity represent only three modes or aspects of the divine revelation, not distinct and coexisting persons in the divine nature. 2 Music the use of modal melodies and harmonies. Derivatives modalist noun & adjective modalism in other Oxford dictionaries Definition of modalism in the British & World English dictionary