In the lexicon of certain branches of Christianity, especially the Roman Catholic

Roman Catholic Church

The Catholic Church, also known as the Roman Catholic Church, is the world's largest Christian church, with over a billion members. Led by the Pope, it defines its mission as spreading the gospel of Jesus Christ, administering the sacraments and exercising charity...

, Anglican

Anglicanism

Anglicanism is a tradition within Christianity comprising churches with historical connections to the Church of England or similar beliefs, worship and church structures. The word Anglican originates in ecclesia anglicana, a medieval Latin phrase dating to at least 1246 that means the English...

, and Orthodox branches, religious as a noun

Noun

In linguistics, a noun is a member of a large, open lexical category whose members can occur as the main word in the subject of a clause, the object of a verb, or the object of a preposition .Lexical categories are defined in terms of how their members combine with other kinds of...

 usually refers to a member of a religious order

Religious order

A religious order is a lineage of communities and organizations of people who live in some way set apart from society in accordance with their specific religious devotion, usually characterized by the principles of its founder's religious practice. The order is composed of initiates and, in some...

 of monk

Monk

A monk is a person who practices religious asceticism, living either alone or with any number of monks, while always maintaining some degree of physical separation from those not sharing the same purpose...

s, nun

Nun

A nun is a woman who has taken vows committing her to live a spiritual life. She may be an ascetic who voluntarily chooses to leave mainstream society and live her life in prayer and contemplation in a monastery or convent...

s, friars, clerics regular, or other individuals who take the three vows of poverty, chastity, and obedience (the evangelical counsels

Evangelical counsels

The three evangelical counsels or counsels of perfection in Christianity are chastity, poverty , and obedience . As Jesus of Nazareth stated in the Canonical gospels , they are counsels for those who desire to become "perfect"...

). Neither of those groups should be identified as clergy

Clergy

Clergy is the generic term used to describe the formal religious leadership within a given religion. A clergyman, churchman or cleric is a member of the clergy, especially one who is a priest, preacher, pastor, or other religious professional....

, which in Catholicism includes bishop

Bishop

A bishop is an ordained or consecrated member of the Christian clergy who is generally entrusted with a position of authority and oversight. Within the Catholic Church, Eastern Orthodox, Oriental Orthodox Churches, in the Assyrian Church of the East, in the Independent Catholic Churches, and in the...

s, priests and deacons.

Though seemingly redundant, there are also "religious priests" who are members of orders, such as the Society of Jesus

Society of Jesus

The Society of Jesus is a Catholic male religious order that follows the teachings of the Catholic Church. The members are called Jesuits, and are also known colloquially as "God's Army" and as "The Company," these being references to founder Ignatius of Loyola's military background and a...

 or the Franciscans. The term is used to differentiate such clergy from secular priests

Secular clergy

The term secular clergy refers to deacons and priests who are not monastics or members of a religious order.-Catholic Church:In the Catholic Church, the secular clergy are ministers, such as deacons and priests, who do not belong to a religious order...

 (or diocesan priests), who serve under a bishop

Bishop

A bishop is an ordained or consecrated member of the Christian clergy who is generally entrusted with a position of authority and oversight. Within the Catholic Church, Eastern Orthodox, Oriental Orthodox Churches, in the Assyrian Church of the East, in the Independent Catholic Churches, and in the...

 or archbishop

Archbishop

An archbishop is a bishop of higher rank, but not of higher sacramental order above that of the three orders of deacon, priest , and bishop...

 who has jurisdiction over a geographically defined diocese

Diocese

A diocese is the district or see under the supervision of a bishop. It is divided into parishes.An archdiocese is more significant than a diocese. An archdiocese is presided over by an archbishop whose see may have or had importance due to size or historical significance...

.