ETYM Latin diatonicus, diatonus, Greek, to stretch out; dia through + tenein to stretch: cf. French diatonique. Related to Tone.
1. Based on or using the five tones and two semitones of the major or minor scales of Western music.
2. (Music) Based on the standard major or minor scales consisting of 5 tones and 2 semitones without modulation by accidentals.
Music, containing no accidentals; denoting the standard 8-tone scale.