An air or song; a melody; a tune.

(Ital.) : Composition for solo voice, usually a movement of a larger work ( cantata, oratorio, opera).

A solo vocal piece in an opera or operetta usually of a melodic and reflective nature.

a movement for solo voice and instrumental accompaniment, often a section of a larger work, such as an opera, oratorio, or cantata. In the early seventeenth century the term also was applied to independent pieces for solo voice, generally strophic or set to strophic basses. The term may be applied to instrumental music that has as its main feature a singable melody. [LEB, TMC; GJC