- Of or pertaining to the Trinity, the doctrine of the
Trinity, or believers in that doctrine.
2 . Trinitarian
[ n.]
- One who believes in the doctrine of the Trinity. - One of a monastic order founded in Rome in 1198 by St.
John of Matha, and an old French hermit, Felix of Valois, for the
purpose of redeeming Christian captives from the Mohammedans.