Dissonance has several meanings, all related to conflict or incongruity:

• Consonance and dissonance in music are properties of an interval or chord
• Cognitive dissonance is a state of mental conflict.
• Dissonance in poetry is the deliberate avoidance of assonance, i.e. patterns of repeated vowel sounds. Dissonance in poetry is similar to cacophony and the opposite of euphony.

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