Religious (Catholicism)
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In the lexicon of certain branches of Christianity, especially the Roman Catholic, Anglican, and Orthodox branches, religious as a noun usually refers to a member of a religious order of monks, nuns, friars, clerics regular, or other individuals who take the three vows of poverty, chastity, and obedience (the evangelical councils). Neither of those groups should be identified as clergy, which in Catholicism includes bishops, priests and deacons.
Though seemingly contradictory, there are also "religious priests" used in reference to priests who are members of orders, such as the Society of Jesus or the Franciscans. Such clergy are differentiated from diocesan priests who serve under a bishop or archbishop who has jurisdiction over a geographically defined diocese.