from the Greek πολύς and σάμα, a term applied to such intervals and chords in harmony, as produce upon the ear the same effect, although they may differ from each other in notation; for example, b B G ♭ A G; B D F ♯ A, B D ♯ E ♭ G, &c. Also such chords as, although expressed by the same notes, are yet referrible to different harmonic foundations.