| A | B |
|---|
| Aaron | Moses' brother. |
| Andrew | St. Peter's brother. |
| Archdiocese | Main diocese in a province. |
| Assumption | Mary's return to heaven at the end of her life. |
| Anthony | Patron of lost objects. |
| Advent | Four week season before Christmas. |
| Alb | Clothing worn by priest. |
| Alpha and Omega | First and last letters of the Greek alphabet. |
| Apostle | One of the twelve special helpers of Jesus. |
| Abraham | Father of the Jewish people. |
| Angela | Founder of first woman's teaching order. |
| Ascension | Jesus' return to heaven. |
| Ann | Mother of Mary. |
| Alleluia | Word meaning "Praise the Lord." |
| Amen | Word meaning "So be it." |
| Annunciation | Visit of Gabriel to Mary. |
| Augustine | Great teacher in the early Church. |
| Altar | Table-like object where Mass is celebrated. |
| Adam | First man created by God. |
| Adonai | Hebrew word for Lord. |
