Canon law of the Catholic Church in the context of "Mission sui juris"

Enclosed religious orders are religious orders whose members strictly separate themselves from the affairs of the external world. The term cloistered is synonymous with enclosed. In the Catholic Church, enclosure is regulated by the code of canon law, either the Latin code or the Oriental code, and also by the constitutions of the specific order. It is practised with a variety of customs according to the nature and charism of the community in question. This separation may involve physical barriers such as walls and grilles (that is, a literal cloister), with entry restricted for other people and certain areas exclusively permitted to the members of the convent. Outsiders may only temporarily enter this area under certain conditions (for example, if they are candidates for the order, doctors or craftsmen). The intended purpose for such enclosure is to prevent distraction from prayer and the religious life and to keep an atmosphere of silence.

Under certain circumstances, exceptions may be granted for enclosed men or women to leave the enclosure temporarily or permanently.

The canon law of the Eastern Orthodox Church consists of the ecclesiastical regulations recognised by the authorities of the Eastern Orthodox Church, together with the discipline, study, and practice of Eastern Orthodox jurisprudence.

In the Eastern Orthodox Church, canon law is a behavioural standard that aims to apply dogma to practical situations in the daily life of Eastern Orthodox Christians. According to Mihai Vasile, unlike the canon law of the Catholic Church, Eastern Orthodox canon law is corrective rather than prescriptive, which means it is formulated in response to certain questions, challenges, or situations.

In the canon law of the Catholic Church, excommunication (Lat. ex, "out of", and communio or communicatio, "communion"; literally meaning "exclusion from communion") is a form of censure. In the formal sense of the term, excommunication includes being barred not only from the sacraments but also from the fellowship of Christian baptism. The principal and severest censure, excommunication presupposes guilt; and being the most serious penalty that the Catholic Church can inflict, it supposes a grave offense. The excommunicated person is considered by Catholic ecclesiastical authority as an exile from the Church, for a time at least.

Excommunication is intended to invite the person to change behaviour or attitude, repent, and return to full communion. It is not an "expiatory penalty" designed to make satisfaction for the wrong done, much less a "vindictive penalty" designed solely to punish. Excommunication, which is the gravest penalty of all, is always "medicinal".

Sui iuris (/ˈsuːaɪ ˈdʒʊərɪs/), also spelled sui juris, is a Latin phrase that literally means "of one's own right". It is used in both the Catholic Church's canon law and secular law. The term church sui iuris is used in the Catholic Code of Canons of the Eastern Churches (CCEO) to denote the autonomous churches in Catholic communion. The Catholic Church consists of 24 churches, including the Latin Church and 23 Eastern Catholic churches.

Pacta sunt servanda ("agreements must be kept") is a brocard and a fundamental principle of law which holds that treaties or contracts are binding upon the parties that entered into the treaty or contract. It is customary international law. According to Hans Wehberg, a professor of international law, "few rules for the ordering of Society have such a deep moral and religious influence" as this principle.

In its most common sense, the principle refers to private contracts and prescribes that the provisions, i.e. clauses, of a contract are law between the parties to the contract, and therefore implies that neglect of their respective obligations is a violation of the contract. The first known expression of the brocard is in the writings of the canonist Cardinal Hostiensis from the 13th century AD, which were published in the 16th.

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 Roman Catholic Church, the term minister is used with various meanings. Most commonly, the word refers to a person, either lay or ordained, who is commissioned to perform some act on behalf of the Catholic Church. It is not a particular office or rank of clergy, as is the case in some other Christian organisations; rather, minister may be used as a collective term for vocational or professional pastoral leaders including clergy (bishops, deacons, priests) and non-clergy (theologians and lay ecclesial ministers). It is also used in reference to the canonical and liturgical administration of sacraments, as part of some offices, and with reference to the exercise of the lay apostolate.