Religious vows are the public vows made by the members of religious communities pertaining to their conduct, practices, and views.
In the Buddhist tradition, in particular within the Mahayana and Vajrayana traditions, many different kinds of religious vows are taken by the lay community as well as by the monastic community, as they progress along the path of their practice. In the monastic tradition of all schools of Buddhism, the Vinaya expounds the vows of the fully ordained Nuns and Monks.
A military order (Latin: Ordo militaris) is a Latin Catholic religious order of knights. The original military orders were the Knights Templar, the Knights Hospitaller, the Order of the Holy Sepulchre, the Order of Saint James, the Order of Calatrava, and the Teutonic Knights. They arose in the Middle Ages in association with the Crusades – the Crusader states (mainly the Kingdom of Jerusalem in the Holy Land), the Baltics, and the Iberian peninsula; their members being initially dedicated to the protection of Christian pilgrims, and eventually to the defence of the Crusader states and the conquest of non-Christian or even non-Catholic lands. They are the predecessors of chivalric orders.
Most members of military orders were laymen who took religious vows, such as of poverty, chastity, and obedience, according to monastic ideals. The orders owned houses called commanderies all across Europe and had a hierarchical structure of leadership with the grand master at the top.
A territorial abbey (or territorial abbacy) is a particular church of the Catholic Church comprising defined territory which is not part of a diocese but surrounds an abbey or monastery whose abbot or superior functions as ordinary for all Catholics and parishes in the territory. Such an abbot is called a territorial abbot or abbot nullius diœceseos (abbreviated abbot nullius and Latin for "abbot of no diocese"). A territorial abbot thus differs from an ordinary abbot, who exercises authority only within the monastery's walls or to monks or canons who have taken their vows there. A territorial abbot is equivalent to a diocesan bishop in Catholic canon law.
While most belong to the Latin Church, and usually to the Benedictine or Cistercian Orders, there is one Eastern Catholic territorial abbey: the Italo-Albanian Greek Catholic Abbey of Grottaferrata. The closest equivalent in the Eastern Orthodox Church would be a stauropegion (e.g. most famously, Mount Athos).
In the Catholic Church, a religious institute is "a society in which members, according to proper law, pronounce public vows, either perpetual or temporary which are to be renewed, however, when the period of time has elapsed, and lead a life of brothers or sisters in common."
A religious institute is one of the two types of institutes of consecrated life; the other is the secular institute, where its members are "living in the world". Religious institutes come under the jurisdiction of the Dicastery for Institutes of Consecrated Life and Societies of Apostolic Life.
A religious sister (abbreviated: Sr.) in Christianity is a woman who has taken public vows in a religious order dedicated to apostolic works, as distinguished from a nun who lives a cloistered monastic life dedicated to prayer and labor, or a canoness regular, who provides a service to the world, either teaching or nursing, within the confines of the monastery. Nuns, religious sisters and canonesses all use the term "Sister" as a form of address. Religious sisters are found in various traditions of Christianity, particularly Catholicism, Evangelical Lutheranism and Anglicanism.
In the Catholic Church, religious sisters are associated with a religious institute. The HarperCollins Encyclopedia of Catholicism (1995) defines "congregations of sisters [as] institutes of women who profess the simple vows of poverty, chastity, and obedience, live a common life, and are engaged in ministering to the needs of society." As William Saunders writes: "When bound by simple vows, a woman is a sister, not a nun, and thereby called 'sister'. Nuns recite the Liturgy of the Hours or Divine Office in common [...] [and] live a contemplative, cloistered life in a monastery [...] behind the 'papal enclosure'. Nuns are permitted to leave the cloister only under special circumstances and with the proper permission."
In Christianity, the three evangelical counsels, or counsels of perfection, are poverty, chastity, and obedience. As stated by Jesus Christ in the canonical gospels, they are counsels for those who desire to become "perfect" (τελειος, teleios).
The Catholic Church interprets this to mean that they are not binding upon all, and hence not necessary conditions to attain eternal life (heaven), but that they are "acts of supererogation", "over and above" the minimum stipulated in the biblical commandments. Catholics and Lutherans who have made a public profession to order their lives by the evangelical counsels, and confirmed this by public vows before their competent church authority (the act of religious commitment known as a profession), are recognised as members of the consecrated life.