GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Tercet , n. [F., fr. It. terzetto, dim. of terzo, third, L. tertius. See Tierce, and cf. Terzetto.]
   (Mus.) A triplet.
   Hiles.
   
   1913 Webster
   (Poetry) A triplet; a group of three lines.
   1913 Webster