dissonance

[ dis-uh-nuh ns ]
/ ˈdɪs ə nəns /

noun

inharmonious or harsh sound; discord; cacophony.
Music.
  1. a simultaneous combination of tones conventionally accepted as being in a state of unrest and needing completion.
  2. an unresolved, discordant chord or interval.Compare consonance(def 3).
disagreement or incongruity.

Origin of dissonance

1565–75; < Late Latin dissonantia, equivalent to disson- (see dissonant) + -antia -ance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for dissonance

dissonance

dissonancy

/ (ˈdɪsənəns) /

noun

a discordant combination of sounds
lack of agreement or consistency
music
  1. a sensation commonly associated with all intervals of the second and seventh, all diminished and augmented intervals, and all chords based on these intervalsCompare consonance (def. 3)
  2. an interval or chord of this kind
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012