In a periodic scale, the equave (/ˈiːkwɪv/ EE-kwiv or /ˈiːkwəv/ EE-kwəv), also called interval of equivalence or equivalency interval, is the interval such that pitches separated by it are considered equivalent. The term equave was coined by Inthar.
- In octave-equivalent scales, the equave is 2/1.
- In Bohlen-Pierce, the equave is 3/1.
- In edfs, the equave is 3/2.