Holding what is regarded as the correct opinion, or correct opinions, especially in regard to religious or theological doctrines; sound in opinion or doctrine; specifically, conforming to the faith of the Church Catholic, as represented in its primitive ecumenical creeds: applied to persons or doctrines.[capitalized] Of or pertaining to the Greek Church.Synonyms Orthodox, Evangelical. (See the definitions of these terms.) It is natural for all who care about their doctrinal beliefs to claim the titles that indicate correctness of belief. Hence orthodox is a part of the name of the Greek Church; to the Roman Catholic orthodox means faithful to the tenets of the Roman Church; in the doctrinal contests of America orthodox has generally meant Calvinistic, especially as opposed to Unitarianism and Universalism; in England it has as generally meant High-church, as opposed to Low-church or evangelical. Evangelical, meaning in harmony with the Gospel, has been claimed somewhat similarly and for a like reason, but has been especially applied to those who emphasize the doctrine of salvation by faith in Christ alone.