# Equave

(Redirected from Equivalence interval)

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In a periodic scale, the **equave** (/ˈiːkwɪv/ *EE-kwiv* or /ˈiːkwəv/ *EE-kwəv*), also called **interval of equivalence**, **equivalence interval**, **formal octave**^{[1]} or **pseudo-octave**^{[2]}^{[note 1]}, is the interval such that pitches separated by it are considered equivalent and are elements of the same pitch class.

The equave of a scale is generally the same as its period or a multiple of its period.

## Etymology

The term *equave* was coined by Inthar. It is a portmanteau of *equivalence* and *octave*.

## Examples

- In octave-equivalent scales, the equave is 2/1.
- In Bohlen-Pierce, the equave is 3/1.
- In edfs, the equave is 3/2.

## See also

## Notes

- ↑ The term
*pseudo-octave*generally designates any kind of equave, although it is sometimes used specifically to designate a stretched or compressed octave.

## References

- ↑ Op de Coul, E.F. Scala help.
- ↑ ASCL Specification. Ableton.