- Abendana
- Abenezra
- Abensberg
- Abeokuta
- Aberavon
- Abercarn
- Abercorn, James Hamilton
- Abercrombie, John
- Abercromby, David
- Abercromby, Patrick
- Abercromby, Sir Ralph
- Aberdare, Henry Austin Bruce, 1st Baron
- Aberdare
- Aberdeen, George Gordon, 1st Earl of
- Aberdeen, George H. Gordon, 4th Earl of
- Aberdeen (burgh)
- Aberdeen (city)
- Aberdeenshire
- Aberdour
- Aberdovey
- Aberfoyle
- Abergavenny
- Aberigh-Mackay, George Robert
- Abernethy, John (priest)
- Abernethy, John (surgeon)
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- Aberration
- Abersychan
- Abertillery
- Aberystwyth
- Abettor
- Abeyance
- Abgar
- Abhidhamma
- Abhorrers
- Abiathar
- Abich, Otto Wilhelm Hermann von
- Abigail
- Abijah
- Abila
- Abildgaard, Nikolaj Abraham
- Abimelech
- Abingdon
- Abinger, James Scarlett, 1st Baron
- Abington, Frances
- Abiogenesis
- Abipones
- Abitibbi
- Abjuration
- Abkhasia
- Ablation
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- Ablatitious
- Ablative
- Ablution
- Abnaki
- Abner
- Abo
- Abo-Bjorneborg
- Abode
- Abomasum
- Abomey
- Abomination
- Abor Hills
- Aborigines
- Abortion
- Aboukir
- About, Edmond Francois Valentin
- Abrabanel, Isaac
- Abracadabra
- Abraham
- Abraham a Sancta Clara
- Abraham Ibn Daud
- Abrahamites
- Abraham-men
- Abrantes
- Abrasion
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- Abraum Salts
- Abraxas
- Abrogation
- Abruzzi e Molise
- Absalom
- Absalon
- Abscess
- Abscissa
- Abscission
- Abscond
- Absence
- Absenteeism
- Absinthe
- Absolute
- Absolution
- Absolutism
- Absorption of light
- Abstemii
- Abstinence
- Abstraction
- Abstract of title
- Abt, Franz
- Abu
- Abu-Bekr
- Abu Hamed
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