dis⋅so⋅nance  /ˈdɪsənəns/ Show Spelled Pronunciation [dis-uh-nuhns]
–noun
1. inharmonious or harsh sound; discord; cacophony.
2. Music. a.
a simultaneous combination of tones conventionally accepted as being in a state of unrest and needing completion.
b. an unresolved, discordant chord or interval. Compare consonance (def. 3).
3. disagreement or incongruity.