major diatonic scale n. Mus., The natural diatonic scale, which has semitones between the third and fourth, and seventh and eighth notes, and whole tones between the other notes;  the scale of the major mode, of which the third is major; also called major scale.   See Scale, and Diatonic.

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 major diatonic scale
      n : a diatonic scale with notes separated by whole tones except
          for the 3rd and 4th and 7th and 8th [syn: major scale]