n.; pl. E. Sopranos It. Soprani [ It., fr. soprano superior, highest, fr. sopra above, L. supra. See Sovereign. ] (Mus.) (a) The treble; the highest vocal register; the highest kind of female or boy's voice; the upper part in harmony for mixed voices. (b) A singer, commonly a woman, with a treble voice. [ 1913 Webster ]