Neutral interval

In music theory, a neutral interval in 24 TET (including extensions), (but also known as a submajor interval, or as a superminor interval, in Just Intonation), is an interval that is neither major nor minor, but is, instead, in-between them.

In 12 TET, these intervals are a quarter tone sharper than minor intervals and a quarter tone flatter than major intervals. For example, the minor third is tuned at 300 ¢, while the major third is a semitone (100 ¢) sharper (400 ¢), and so the neutral third lies between them at 350 ¢.

A neutral interval inverts to another neutral interval.

In just intonation, as well as in tunings such as 31-ET, 41-ET, or 72-ET, which more closely approximate it with more of them, such intervals can be closer together.