1983 Code of Canon Law in the context of "Enclosed religious orders"

In the Catholic Church, an association of the Christian faithful or simply association of the faithful (Latin: consociationes christifidelium), sometimes called a public association of the faithful, is a group of baptized persons, clerics or laity or both together, who, according to the 1983 Code of Canon Law, jointly foster a more perfect life or promote public worship or Christian teaching, or who devote themselves to other works of the apostolate.

A 20th-century resurgence of interest in lay societies culminated in the Second Vatican Council, but lay ecclesial societies have long existed in forms such as sodalities (defined in the 1917 Code of Canon Law as associations of the faithful constituted as an organic body), confraternities (similarly defined as sodalities established for the promotion of public worship), medieval communes, and guilds.

In the Catholic Church, a titular church (Italian: titolo cardinalizio) is a church in Rome that is assigned to a member of the clergy who is created a cardinal. These are Catholic churches in the city, within the jurisdiction of the Diocese of Rome, that serve as honorary designations symbolising the relationship of cardinals to the pope, the bishop of Rome. According to the 1983 Code of Canon Law, a cardinal may assist his titular church through counsel or through patronage, although "he has no power of governance over it, and he should not for any reason interfere in matters concerning the administration of its good, or its discipline, or the service of the church".

There are two ranks of titular churches: titles and deaconries. A title (Latin: titulus) is a titular church that is assigned to a cardinal priest (a member of the second order of the College of Cardinals), whereas a deaconry (Latin: diaconia) is normally assigned to a cardinal deacon (a member of the third order of the college). If a cardinal priest or a cardinal deacon is later appointed a cardinal bishop (a member of the first order of the college), he is typically transferred from his titular church to the vacant title of a suburbicarian diocese in the vicinity of Rome. Patriarchs of Eastern Catholic Churches who are created cardinal bishops are not assigned titles of suburbicarian dioceses.

The Eastern Catholic canon law is the law of the 23 Catholic sui juris (autonomous) particular churches of the Eastern Catholic tradition. Eastern Catholic canon law includes both the common tradition among all Eastern Catholic Churches, now chiefly contained in the Code of Canons of the Eastern Churches, as well as the particular law proper to each individual sui juris particular Eastern Catholic Church. Oriental canon law is distinguished from Latin canon law, which developed along a separate line in the remnants of the Western Roman Empire, and is now chiefly codified in the 1983 Code of Canon Law.

The Code of Canons of the Eastern Churches (CCEC; Latin: Codex Canonum Ecclesiarum Orientalium, abbreviated CCEO) is the title of the 1990 work which is a codification of the common portions of the canon law for the 23 Eastern Catholic Churches in the Catholic Church. It is divided into 30 titles and has a total of 1546 canons. The code entered into force in 1991.

The western Latin Church is governed by its own particular code, the 1983 Code of Canon Law.

In the liturgical traditions of the Catholic Church, the term ordination refers to the means by which a person is included in one of the holy orders of bishops, priests, or deacons. The teaching of the Catholic Church on ordination, as expressed in the 1983 Code of Canon Law, the Catechism of the Catholic Church, and Ordinatio sacerdotalis (an apostolic letter), is that only a Catholic male validly receives ordination (ex opere operato), and "that the Church has no authority whatsoever to confer priestly ordination on women and that this judgment is to be definitively held by all the Church's faithful." In other words, the male priesthood is not considered by the church a matter of policy but an unalterable requirement of God. As with priests and bishops, the church ordains only men as deacons.

In the Catholic Church, a parish (Latin: parochia) is a stable community of the faithful within a particular church, whose pastoral care has been entrusted to a parish priest (Latin: parochus), under the authority of the diocesan bishop. It is the lowest ecclesiastical subdivision in the Catholic episcopal polity, and the primary constituent unit of a diocese or eparchy. Parishes are extant in both the Latin and Eastern Catholic Churches. In the 1983 Code of Canon Law, parishes are constituted under cc. 515–552, entitled "Parishes, Pastors, and Parochial Vicars."

Eucharist (Koine Greek: εὐχαριστία, romanized: eucharistía, lit. 'thanksgiving') is the name that Catholic Christians give to the sacrament by which, according to their belief, the body and blood of Christ are present in the bread and wine consecrated during the Catholic eucharistic liturgy, generally known as the Mass. The definition of the Eucharist in the 1983 Code of Canon Law as the sacrament where Christ himself “is contained, offered, and received” points to the three aspects of the Eucharist according to Catholic theology: the real presence of Christ in the Eucharist, Holy Communion, and the holy sacrifice of the Mass.

The name Eucharist comes from the Greek word eucharistia which means 'thanksgiving" and which refers to the accounts of the last supper in Matthew 26:26–28, Mark 14:22–24, Luke 22:19–20 and 1 Corinthians 11:23–29, all of which narrate that Jesus "gave thanks" as he took the bread and the wine.

The Corpus Juris Canonici (lit. 'Body of Canon Law') is a collection of significant sources of the Canon law of the Catholic Church that was applicable to the Latin Church. It was replaced by the 1917 Code of Canon Law which went into effect in 1918. The 1917 Code was later replaced by the 1983 Code of Canon Law, the codification of canon law currently in effect for the Latin Church.

The Corpus Juris Canonici was used in canonical courts of the Catholic Church such as those in each diocese and in the courts of appeal at the Roman Curia such as the Roman Rota.