Trinity

(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, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace.

(noun) the union of the Father and Son and Holy Ghost in one Godhead. Synonyms: Holy Trinity, Blessed Trinity, Sacred Trinity.

(noun) three people considered as a unit. Synonyms: trio, threesome, triad, trinity.