A stanza comprising of three lines e.g. The Old Familiar Faces by Charles Lamb.
[n] a set of three similar things considered as a unit
[n] one of three offspring born at the same time from the same pregnancy
[n] the cardinal number that is the sum of one and one and one
3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, triad, trine, trinity, trio, trio, troika