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diatonicism

[dahy-uh-ton-uh-siz-uh m]
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noun
  1. the use of diatonic harmony; composition in a diatonic idiom.
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Origin of diatonicism

First recorded in 1930–35; diatonic + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018