"Tripersonalist" is a word in ENGLISH

See Trinitarian.

Among Trinitarians, one of the three subdivisions of the Godhead (the Father, the Son, and the Holy Ghost); an hypostasis.

A monk of an order founded in 1197; -- so called because the order was especially devoted to the redemption …

One who believes in the doctrine of the Trinity.

Of or pertaining to the Trinity, the doctrine of the Trinity, or believers in that doctrine.

One of a monastic order founded in Rome in 1198 by St. John of Matha, and an old French hermit, …

The doctrine of the Trinity; the doctrine that there are three distinct persons in the Godhead.