The Language of the Faith
Catholic Vocabulary
Key terms defined clearly — for converts, inquirers, and Catholics who want to go deeper.
A
Apostolic Succession
The unbroken chain of bishops from the Apostles to the present day, through which the Church's authority and sacramental power are transmitted. Catholics believe this succession is essential to the validity of orders and sacraments.
Assumption
The dogma that the Virgin Mary, at the end of her earthly life, was taken body and soul into heavenly glory. Defined as dogma by Pope Pius XII in 1950.
B
Beatification
The second step in the canonization process, in which the Pope declares that a deceased person is in heaven and may be publicly venerated in a specific region or religious community.
C
Canon Law
The body of laws and regulations governing the Catholic Church. The current Code of Canon Law was promulgated in 1983 for the Latin Church.
Catechism
A summary of Catholic doctrine, typically in question-and-answer format. The Catechism of the Catholic Church (CCC), published in 1992, is the authoritative modern reference.
Conclave
The gathering of the College of Cardinals to elect a new Pope, held in the Sistine Chapel under strict secrecy. The word comes from the Latin cum clave — 'with a key.'
D
Deuterocanonical
The seven books included in the Catholic Old Testament but not in the Hebrew Bible or most Protestant Bibles: Tobit, Judith, 1–2 Maccabees, Wisdom, Sirach, and Baruch. Catholics consider these fully inspired Scripture.
Dogma
A truth revealed by God and formally defined by the Church as requiring the assent of faith. Examples include the Trinity, the Incarnation, and the Immaculate Conception.
E
Encyclical
A formal letter from the Pope addressed to the bishops and faithful of the whole Church, typically addressing matters of doctrine, morality, or social teaching.
Eucharist
The central sacrament of the Catholic Church, in which bread and wine become the Body and Blood of Jesus Christ. Catholics believe this transformation — transubstantiation — is real and not merely symbolic.
Ex Cathedra
Latin for 'from the chair.' Refers to a formal papal pronouncement made with the full authority of the papal office on a matter of faith or morals, binding the whole Church. Such pronouncements are considered infallible.
I
Immaculate Conception
The dogma that Mary was conceived without original sin, preserved by God in anticipation of her role as the Mother of Christ. Defined as dogma by Pope Pius IX in 1854. Not to be confused with the Virgin Birth.
Indulgence
The remission of temporal punishment due to sin, whose guilt has already been forgiven. Indulgences are granted by the Church through prayer, acts of charity, or other prescribed works. The sale of indulgences — condemned by the Church itself — was a major abuse that sparked the Reformation.
Infallibility
The charism by which the Church is preserved from error in defining matters of faith and morals. Applies to the Pope speaking ex cathedra and to the college of bishops in union with the Pope defining doctrine for the whole Church.
L
Latria
The highest form of worship, due to God alone. Distinguished from dulia (honor given to saints) and hyperdulia (special honor given to Mary). Catholics worship God; they venerate saints.
Liturgy
The official public worship of the Church, especially the Mass and the Divine Office (Liturgy of the Hours). From the Greek leitourgia — 'public service.'
M
Magisterium
The teaching authority of the Church, exercised by the Pope and bishops in communion with him. The Magisterium interprets Scripture and Tradition and defines doctrine for the faithful.
Mass
The central act of Catholic worship, also called the Eucharist or the Divine Liturgy. It re-presents the sacrifice of Christ on Calvary and includes the Liturgy of the Word and the Liturgy of the Eucharist.
O
Original Sin
The sin committed by Adam and Eve, whose effects — loss of sanctifying grace, inclination toward sin, suffering, and death — are inherited by all human beings. Baptism removes original sin.
P
Papal Infallibility
The doctrine that the Pope, when speaking ex cathedra on matters of faith and morals for the whole Church, is preserved from error by the Holy Spirit. Defined at Vatican I (1870). Not a claim that the Pope is sinless or always right.
Purgatory
A state of purification after death for souls destined for heaven who still carry the effects of forgiven sin. Not a second chance at salvation — only the saved pass through it. Supported by 2 Maccabees 12:46 and 1 Corinthians 3:15.
R
Rosary
A form of prayer using beads to count repetitions of the Hail Mary, Our Father, and Glory Be, while meditating on the mysteries of Christ's life. One of the most popular Catholic devotions.
S
Sacrament
An outward sign instituted by Christ to give grace. The seven sacraments are: Baptism, Confirmation, Eucharist, Reconciliation, Anointing of the Sick, Holy Orders, and Matrimony.
Sacred Tradition
The living transmission of the Gospel through the Church's life, worship, and teaching — distinct from but complementary to Sacred Scripture. Together, Scripture and Tradition constitute the single deposit of the Word of God.
T
Transubstantiation
The change by which the substance of bread and wine becomes the Body and Blood of Christ at the consecration of the Mass, while the appearances (accidents) of bread and wine remain. Defined at the Fourth Lateran Council (1215) and reaffirmed at Trent.
V
Veneration
Honor and reverence given to Mary and the saints — distinct from worship, which is due to God alone. Catholics ask saints to intercede for them, just as they might ask a living friend to pray for them.
Vatican
The Vatican City State, an independent city-state within Rome, is the headquarters of the Catholic Church and the residence of the Pope. Vatican II (1962–1965) was the 21st Ecumenical Council, which addressed the Church's relationship with the modern world.