Same word as trichotomy:
menage a trois, ternary, ternion, third, triad, trichotomy, trilogy, trinity, trio, tripartition, triplet, triplets, triplex, triplicate, triplication, triplicity, triumvirate, trivium, troika
menage a trois, ternary, ternion, third, triad, trichotomy, trilogy, trinity, trio, tripartition, triplet, triplets, triplex, triplicate, triplication, triplicity, triumvirate, trivium, troika