Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
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Right belief as compared with heterodoxy or heresy. The term is used in the East to identify those churches (not united with Rome) which accepted the ancient councils, notably Ephesus and Chalcedon, and which call themselves "the holy, orthodox, catholic, Eastern Church." In the West the word is sometimes used to describe a justifiable concern for sound doctrine in the Catholic faith. (Etym. Greek orthos, right + doksa, opinion: orthodoksa, having the right opinion.)