TRINITY, n. In the multiplex theism of certain Christian churches, three entirely distinct deities consistent with only one. Subordinate deities of the polytheistic faith, such as devils and angels, are not dowered with the power of combination, and must urge individually their claims to adoration and propitiation. The Trinity is one of the most sublime mysteries of our holy religion. In rejecting it because it is incomprehensible, Unitarians betray their inadequate sense of theological fundamentals. In religion we believe only what we do not understand, except in the instance of an intelligible doctrine that contradicts an incomprehensible one. In that case we believe the former as a part of the latter.
2009 Update: A Christian formulation for one being in three persons. Examples include the divine trinity of Father, Son and Holy Spirit; the earthly trinity of sinner, neighbor and pagan and the ecclesiastical trinity of the Fellowship Committee.