[trin.i.tar.i.an] adj (1628) 1 cap: of or relating to the Trinity, the doctrine of the Trinity, or adherents to that doctrine
2: having three parts or aspects: threefold Trinitarian n (1628) 1: a member of a religious teaching and nursing order for men founded in France in 1198 by John of Matha and Philip of Valois
2: one who subscribes to the doctrine of the Trinity -- Trin.i.tar.i.an.ism n