dis ‧ so ‧ nance /ˈdɪsənəns/ BrE AmE noun
[ Date: 1400-1500 ; Language: Latin ; Origin: dissonare , from sonare 'to sound' ]
1 . [uncountable and countable] technical a combination of notes that sound strange because they are not in ↑ harmony OPP consonance
2 . [uncountable] formal lack of agreement
—dissonant adjective