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atonalism

[ey-tohn-l-iz-uh m]
noun Music.
  1. atonality.
  2. a note, phrase, etc., that seems harsh or discordant.
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Origin of atonalism

First recorded in 1925–30; atonal + -ism
Related formsa·ton·al·ist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018