- Achiacharus
- Achill
- Achilles
- Achilles Tatius
- Achillini, Alessandro
- Achimenes
- Achin
- Acholi
- Achromatism
- Acid
- Acidalius, Valens
- Acid-Amides
- Acinaces
- Acineta
- Acinus
- Acireale
- Acis
- Ackerman, Francis
- Ackermann, Johann Christian Gottlieb
- Ackermann, Louise Victorine Choquet
- Ackermann, Rudolph
- Acknowledgment
- Acland, Christian Henrietta Caroline
- Acland, Sir Henry Wentworth, Bart.
- Acme
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- Acmite
- Acne
- Acoemeti
- Acolyte
- Acominatus, Michael
- Aconcagua
- Aconcio, Giacomo
- Aconite
- Acontius
- Acorn
- Acorus Calamus
- Acosta, Jose de
- Acosta, Uriel
- Acotyledones
- Acoustics
- Acqui
- Acre (state)
- Acre (town)
- Acre (land measure)
- Acridine
- Acro, Helenius
- Acrobat
- Acrogenae
- Acroliths
- Acromegaly
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- Acron
- Acropolis
- Acropolita, George
- Acrostic
- Acroterium
- Act
- Acta Diurna
- Actaeon
- Acta Senatus
- Actinometer
- Actinomycosis
- Actinozoa
- Action
- Actium
- Act of Parliament
- Acton, John Emerich Acton, 1st Baron
- Acton, Sir John Francis Edward, Bart.
- Acton
- Act on Petition
- Acts of the Apostles
- Actuary
- Acuminate
- Acuna, Christoval de
- Acupressure
- Acupuncture
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- Adabazar
- Adad
- Adagio
- Adair, John
- Adalberon
- Adalbert (archbishop)
- Adalvert (bishop)
- Adalia
- Adam
- Adam of Bremen
- Adam (or Adan) de le Hale
- Adam, Alexander
- Adam, Sir Frederick
- Adam, Juliette
- Adam, Lambert Sigisbert
- Adam, Melchior
- Adam, Paul
- Adam, Robert
- Adam, William
- Adamant
- Adamawa
- Adamites
- Adamnan
- Adams, Andrew Leith
- Adams, Charles Francis
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Wikisource contiene el original de o sobre 1911 Encyclopædia Britannica/Vol 1:4. En el cual se ha basado este artículo.