The definition of a trinity is the state of being three, or a set of three.
(noun)An example of a trinity is the holy trinity - Father, Son and Holy Spirit.
See trinity in Webster's New World College Dictionary
See trinity in American Heritage Dictionary 4
noun pl. trin·i·ties
Origin:
Origin: Middle English trinite
Origin: , from Old French
Origin: , from Latin trīnitās
Origin: , from trīnus, trine; see Trine
.Learn more about trinity