Webster's English Dictionary

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dissonance

dis.so.nance \'dis-*-n*n(t)s\ n 1: a mingling of discordant sounds; specif 
   : a clashing musical int erval 2: lack of agreement : DISCORD  3: an 
   unresolved musical note or chord; specif : an interval not in cluded in a 
   major or minor triad or its inversions