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In scale theory, the diatonic semitone, the minor second or the limma is the small step of the diatonic scale.
In just intonation, an interval may be classified as a diatonic semitone if it is reasonably mapped to 1\7 and 1\12 (precisely one step of the diatonic scale and one step of the chromatic scale).
- 256/243, the Pythagorean diatonic semitone (3-limit)
- 16/15, the classic diatonic semitone (5-limit)