DISSONANT Meaning of DISSONANT in English adj. 1 Mus. harsh-toned; unharmonious. 2 incongruous; clashing. dissonance n. dissonantly adv.[ ME f. OF dissonant or L dissonare (as DIS-, sonare sound) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012