Noun
compound interval (plural compound intervals)
(music) an interval that is greater than an octave
Any compound interval can be always decomposed into one or more octaves plus one simple interval. Source: Internet
Since compound intervals are larger than an octave, "the inversion of any compound interval is always the same as the inversion of the simple interval from which it is compounded." Source: Internet
In general, a compound interval may be defined by a sequence or "stack" of two or more simple intervals of any kind. Source: Internet