Select Aachen Aaron Aaron, Ab Abba Abbé Abbess Abbey Abdication Abduction Abel Abigail Abimelech Abiogenesis Abjuration Abortion Abp Abraham Abraham-men Abrogation Abs Absalom Absolute Absolution Access Accession Acosmism Acquired Act Acta Action Active Activism Acts Ad Addiction Addolorata Adequate Adeste Adjuration Administration Adolescence Adonijah Adoptionism Adoration Adoro Adult Adultery Adv Advent Advocatus Aeon Affected Affections Affiliation Affinity Africa, Agape Age Age, Agony Alb Alcoholism, Alexandrian Alexians Alienation Aliturgical All All-powerful Alleluia Allocution Alma Almoner Alms Altar Ambry Ambulate Ambulatory Amende Americanism Amice Ammonian Amniocentesis Amoral Ampullae Amra Amulet An Anabaptists Anagogical Analecta Analogy Anamnesis Ananias Anaphora Anarchism Anastasimatarion Anathema Anchoress Anchorite Ancient Andacollo Andrew Angel Angelic Angelism Anna Annas Annunciation Anointed Anointing Anselmian Ant Ante Antecedent Anthem Anthropocentrism Anthropological Anthropomorphism Anthroposophy Anti-catholicism Anticamera Antichrist Antiochene Antipasch Antitype Antonians Anulus Anxiety Apathy Apocalypse Apocalyptic Apocreas Apodictic Apodosis Apokatastasis Apollinarianism Apollos Apologetics Apologia Apolysis Apostasy Apostle Apostleship Apostles’ Apostolic Apostolica Application Appreciation Approbation Appropriation Apse Aquila Ara Aramaic Arca Arch Archabbot Archangel Archbishop Archconfraternity Archdeacon Archid Area Areopagus Armagh, Armenian Arminianism Arrows Ars Ascension Ascent Asceterion Asceticism Aseity Ash Ashes, Aspergill Aspersion Aspiration Assent A.C. A.C.N. Abbacy Abbot Ablution Abnegation Abomination Absam Absolute Absolutism Abst Abstention Abstinence Abstraction Absurd Abulia Abyssinian Acacians Acceptants Accident Accidents Accidie Acclamation Accommodation Accomplice Acculturation Acolyte Acta Acts Actual Actuality Actus Ad Adam Adamites Adaptation ADM. Adoption, Advent Advocate Affability Affirmation Affusion Agent Agere Aggeus Aggiornamento Agility Aglipayanism Agnoetes Agnosticism Agnus Agrapha Ahab Ain Aisle Aix-la-chapelle Akathistos Akedah Albigensianism Allegorical Allegory Almighty Aloes Alpha Alphabetic Altar Altarpiece Altötting Altruism Altruistic Alumbrados Amadeans Ambition Ambo Ambrosian Amen Amos Amphora Anacephalaeosis Analepsis Analogy Anchor Anchor-cross Angels Angelus Anger Anglican Anglo-catholicism Anima Animism Ann Annihilation Annihilationism Anno Annual Annuario Annulment Antecedent Antependium Anti-semitism Anticipation Anticlericalism Anticonception Antidicomarianites Antidoron Antimony Antimoralism Antinomianism Antinomies Antiochene Antiphon Antiphonary Antiphoner Antipolo Antipope Antisexual Antistes AP. Apocrypha Apocryphal Apostasy Apostolate Apostolic Apostolicam Apostolicity Apotheosis Apparent Apparition Appeal Appellants Appetite Appian April Arcana Arcanum Archetype Archiep Archiepiscopal Archimandrite Archiprb Architrave Archives Archives, Archpriest Arcosolium Arculae Argument Arian Arianism Aridity Aristotelianism Ark Article Artificial Artophorion Ascetical Askesis Asperges A.B. A.C. A.D. A.M. A.M.D.G. A.P.S.A. A.R.S. A.U. AL., APOST., ABRAHAM'S