The name given to the practice in the Primitive Church, of dipping a person, who was being baptized, three times beneath the surface of the water, i.e., at each name of the three Persons in the Blessed Trinity. When Baptism was by affusion or pouring, as is usual at the present time, the affusion was also trine. The Apostolic canons insisted so strongly on this mode of Baptism that they enjoined that the Bishop or Priest who did not thus administer it should be deposed. This threefold method of Baptism still prevails in the Church and is the only proper method of administering this sacrament.