[n] the cardinal number that is the sum of one and one and one
A group of three lines, often rhyming together or with another tercet.
The winged seeds, where they lie cold and low,
Each like a corpse within its grave,
Thine azure sister of the Spring shall blow.
3, deuce-ace, III, leash, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, triplet, troika