Soprano \So*pra"no\, 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.

Source: Webster's Revised Unabridged Dictionary (1913)