The Collaborative International Dictionary of English v.0.48:

Canzone \Can*zo"ne\, n. [It., a song, fr. L. cantio, fr. canere
   to sing. Cf. Chanson, Chant.] (Mus.)
   (a) A song or air for one or more voices, of Proven[,c]al
       origin, resembling, though not strictly, the madrigal.
   (b) An instrumental piece in the madrigal style.
       [1913 Webster]