Pronunciation: (dis'u-nuns),[key] —n. 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. Cf. consonance (def. 3). See illus. under resolution. 3. disagreement or incongruity.