Text: DIATONIC: 1) One of the three genera of music among the Greeks, the other two being the chromatic and enharmonic. 2) The modern major and minor scales. 3) Chords, intervals, and melodic progressions, etc., belonging to one key-scale. A diatonic chord is one having no note chromatically altered. A diatonic interval is one formed by two notes of a diatonic scale unaltered by accidentals.

See Also:

Source: