ternary

(noun) the cardinal number that is the sum of one and one and one. Synonyms: three, 3, III, trio, threesome, tierce, leash, troika, triad, trine, trinity, ternion, triplet, tercet, terzetto, trey, deuce-ace.

(adj) having three units or components or elements. Synonyms: treble, triple, triplex. Examples: "A ternary operation." "A treble row of red beads." "Overcrowding made triple sessions necessary." "Triple time has three beats per measure." "Triplex windows."