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How to sign: the cardinal number that is the sum of one and one and one
Similiar / Same: three, 3, trio, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace, tierce, leash, troika
How to sign: an occasion on which three people engage in sexual activity together
"he tried to convince some newlyweds to have a threesome with him";