a. and sb. Mus. Also (masc.) terzo. [It. terza, fem. of terzo third:L. tertia.] a. adj. The third, as in opera terza, the third work; violino terzo, third violin. b. sb. A third; also in terza, in three parts; terzo = TRIO.
1724. Short Explic. For. Wds. in Mus. Bks., Terza, a Third . Opera Terza, Violina Terza. Ibid., In Terza, Songs or Tunes in Three Parts, the same as Trio below.