A

Abbess

Abbot

Acolyte

Actual grace

Ad limina visits

Alexandrian Rite

Altar

Altar server

Altarage

Ambo

Ambry

Amovibility

Anima Christi

Annulment

Apostolic administrator

Apostolic Chancery

Apostolic life, Society of

Apostolic nuncio

Apostolic prefect

Apostolic succession

Apostolic vicar

Apse

Archbishop

Archpriest (Latin Church)

Auxiliary bishop