Etymology
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atonal (adj.)

in musical composition, "not considering scale or tone," 1911, from a- (3) "not, without" + tonal.

updated on March 08, 2017

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Definitions of atonal from WordNet

atonal (adj.)
characterized by avoidance of traditional western tonality;
Synonyms: unkeyed
From wordnet.princeton.edu, not affiliated with etymonline.