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dissonance

[dis-uh-nuh ns] /ˈdɪs ə nəns/
noun
1.
inharmonious or harsh sound; discord; cacophony.
2.
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).
3.
disagreement or incongruity.
Origin of dissonance
1565-1575
1565-75; < Late Latin dissonantia, equivalent to disson- (see dissonant) + -antia -ance
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for dissonance

dissonance

/ˈdɪsənəns/
noun
1.
a discordant combination of sounds
2.
lack of agreement or consistency
3.
(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 intervals Compare consonance (sense 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
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Word Origin and History for dissonance
n.

early 15c., "disagreement," from Middle French dissonance and directly from Late Latin dissonantia, from Latin dissonantem (see dissonant). Figurative use dates from 1875.

Online Etymology Dictionary, © 2010 Douglas Harper
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