A

Adultery- Voluntary sexual relation of married person with someone other than spouse

Alleluia- praise to god (Hebrew)

Altar- A table or block used to give offering to God

Altar boy/girl- Someone who assists the priest at the altar

Amen- so be it (Hebrew)

Angel- an attendant/messenger of God

Anoint- heal/purification

Apostle- Follower/disciple

Archbishop- Chief bishop of province

Archdeacon- Anglican clergyman after the bishop

Archdiocese- same as Archbishop

Armageddon- the ultimate conflict

Ascension- the ascent of Jesus Christ into heaven

Assumption- the feast of the Virgin Mary; Mary's body goes to heaven