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The practice of following instructions or obeying one of authority.

Occasion of Sin

A way to describe those situations and tendencies that can easily lead people to make sinful choices.


A word that refers to eight days of celebration. The main octave in the Church's year is the octave of Easter.

Oil of Catechumen

The oil used to anoint the head of someone preparing for the sacrament of Baptism. It is most often used in the R.C.I.A. at various times, reminding the catechumen that the strength of Christ is with them on their journey to full initiation.

Oil of the Sick

The oil used to anoint the hands and forehead of a person receiving the sacrament of the Anointing of the Sick. It is usually olive oil, although it can be any vegetable oil, which is then blessed and used for the anointing.

Old Testament

The "old" or "elder" covenant refers to the 46 (for Catholics) books that connect our faith to the faith of Israel, centered on the Mosaic covenant.

The prayer that ends the opening part of the Mass, just before the readings.

Ordained Priesthood

Those who are called to live the priesthood of Jesus in a special way: who lead the Mass, offer the sacrament of Reconciliation, preach and share in other essential leadership roles in the Church.

One of the seven sacraments of the Catholic Church and one of the three sacraments which carry with it a permanent change of status within the Church (Baptism, Confirmation are the other two).

Ordinary Time

One of the main seasons of the Church's liturgical year, designated by a number from one to thirty - four, the maximum number of Sundays in Ordinary Time.

Original Sin

The first selfish act of the first human beings. It shows us that every human being needs God's grace to stay free from sin.


The name of churches from the middle East and eastern Europe who share the Catholic faith but do not recognize the pope as head of the Church.

Our Father (also called The Lord's Prayer)

The first words of the prayer that Jesus taught his disciples, when they asked him to teach them to pray.