2 definitions found From WordNet (r) 2.0 [wn]: tercet noun: the cardinal number that is the sum of one and one and one [syn: {three}, {3}, {III}, {trio}, {threesome}, {tierce}, {leash}, {troika}, {triad}, {trine}, {trinity}, {ternary}, {ternion}, {triplet}, {terzetto}, {trey}, {deuce-ace}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Tercet \Ter"cet\, noun [F., fr. It. terzetto, dim. of terzo, third, L. tertius. See {Tierce}, and cf. {Terzetto}.] 1. (Mus.) A triplet. --Hiles. 2. (Poetry) A triplet; a group of three lines.

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