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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.


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


See also


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


  1. Op de Coul, E.F. Scala help.
  2. ASCL Specification. Ableton.