Diesis
The diesis (/ˈdaɪəsɪs/ DY-ə-sis) most commonly refers to:
- 128/125;
- Any interval about that size. In particular, Zhea Erose defined it as any interval around the size 30 to 39 cents, because those intervals tend to beat at the speed of typical human singing vibrato. Zhea considers 31edo and 34edo for having an interval in this range.
Intervals with the word in the name:
- greater diesis, 648/625
- small diesis, aka magic comma
- minimal diesis, aka tetracot comma
- septimal diesis, 49/48
Normal diesis
The normal diesis is an interval size measure defined as one step of 31edo.