Minor third (diatonic interval category)

A minor third (m3) is an interval that spans two scale steps in the diatonic scale with the minor (narrower) quality. It is generated by stacking 3 fourths octave reduced, and depending on the specific tuning, it ranges from 240 to 343 ¢ (1\5 to 2\7).

In just intonation, an interval may be classified as a major third if it is reasonably mapped to 2\7 and 6\24 (precisely two steps of the diatonic scale and three steps of the chromatic scale). The use of 24edo's 6\24 as the mapping criteria here rather than 12edo's 3\12 better captures the characteristics of many intervals in the 11- and 13-limit.

The minor third can be stacked with a major third to form a perfect fifth, and as such is often involved in chord structures in diatonic harmony.

In TAMNAMS, this interval is called the minor 2-diastep.

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