/ ˈdɪsənəns; NAmE / noun
1.
[ C , U ] ( music ) a combination of musical notes that do not sound pleasant together
OPP consonance
2.
[ U ] ( formal ) lack of agreement
► dis·son·ant / ˈdɪsənənt; NAmE / adjective :
dissonant voices / notes
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WORD ORIGIN
late Middle English : from Old French , from late Latin dissonantia , from Latin dissonant- disagreeing in sound, from the verb dissonare .