- Preface
- Illustrations
- Key to pronunciation
- Aarhus
- Aaron (biblical)
- Aaron (literature)
- Aarsens, Frans van
- Aasen, Ivar Andreas
- Aasvär
- Aasvogel
- Ab
- Ababde
- Abaca
- Abaco, Great and Little
- Abacus (calculating machine)
- Abacus (in architecture)
- Abad (affix)
- Abad (Arab family)
- Abaddon
- Abaka Khan
- Abakansk
- Abalone
- Abancay
- Abbad
- Abbassides, The
- Abbot, Henry Larcom
- ...
- Abbot, Samuel
- Abbot, The
- Abbot, Willis John
- Abbot of Joy
- Abbot of Misrule
- Abbotsford
- Abbott, Austin
- Abbott, Benjamin
- Abbott, Benjamin Vaughan
- Abbott, Charles Conrad
- ...
- Abelin, Johann Philipp
- Abgar
- Abolitionists
- Abul Wefa
- Abumesacka
- Abunda
- Abu Nuwas al-Hasan ibn Hani al-Hakami
- Abu Said Khan
- Abuse of Process
- Abushehr
- Abu-Simbel
- Abu Temmam, Habib
- Abutilon
- Abutment
- Abû-yûsûf Yakûb
- Äby, Christoph Theodor
- Abydos
- Abydos, Bride of
- Abyla and Calpe
- Abysmal Accumulations
- Abyss
- Abyssal Fauna
- Abyssinian Meadow Grass
- Acacia
- Acacians
- Acacius
- Academic Legion
- Académie des Beaux-Arts
- Academus
- Acanthaceæ
- Acanthite
- Acanthocephala
- Acanthopterygii
- Acanthus
- A Capella
- A Capriccio
- Acapulco
- Achelous
- Achen, Johann
- Achenbach, Andreas
- Achenbach, Oswald
- Achene
- Achensee
- Achenwall, Gottfried
- Acorus
- Acosta, Gabriel
- Acts of the Apostles
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- Adams
- Adams, Abigail Smith
- Adams, Alvin
- Adams, Brooks
- Adams, Charles Baker
- Adams, Charles Follen
- Adams, Charles Francis
- Adams, Charles Francis, Jr.
- Adams, Charles Kendall
- Adams, Charles R.
- Adams, Edwin
- Adams, Frederick W.
- Adams, Hannah
- Adams, Henry
- Adams, Henry Carter
- Adams, Herbert Baxter
- Adams, Isaac
- Adams, John
- Adams, John (mutineer)
- Adams, John (teacher)
- Adams, John Couch
- Adams, John Quincy
- Adams, John Quincy, 2d
- Adams, Julius Walker
- Adams, Maude Kiskadden
- Adams, Nehemiah
- Adams, Oscar Fay
- Adams, Parson Abraham
- Adams, Samuel
- Adams, Sarah Fuller Flower
- Adams, Suzanne
- Adams, Thomas
- Adams, William (pioneer)
- Adams, William (allegorist)
- Adams, William (clergyman)
- Adams, William Davenport
- Adams, William Grylls
- Adams, William Taylor
- Adder
- Addicks, John Edward
- Addington, Henry, First Viscount Sidmouth
- Addis, William E.
- Addis Abeba
- Addison, Joseph
- Addisons’s Disease
- Addison’s Walk
- Admirable Crichton
- Admirable Doctor
- Admiral
- Admiral (butterflies)
- Admiral Islands
- Admiralty, The
- Admiralty Inlet
- Admiralty Island
- Admiralty Islands
- Admiralty Law
- Admiralty Sound
- Admission
- Admonitionists
- Adobe
- Adolf
- Adolf I. (Cologne)
- Adolf I. (Mainz)
- Adolf, Wilhelm August Karl Friedrich
- Adolphe
- Adolph of Nassau
- Adolphus of Nassau
- Adolphus Frederick
- Adolphus, John
- Adonai (Old Testament)
- Adonai (Adonis)
- Adonais
- Adonai Shomo
- Adoni Bezek
- Adonic Verse
- Adonijah
- Adonis (mythology)
- Adonis (plant)
- Adoni-Zedek
- Adoption Controversy
- Adoption
- Adoration
- Adoration of the Immaculate Lamb, The
- Adoration of the Magi
- Adour
- Adowa
- Adra
- Adrain, Robert
- Adrammelech
- Adrar
- Adraste
- Adrasteia
- Adrastus
- Adrets, François de Beaumont, Baron des
- Adria
- Adrian (Roman emperor)
- Adrian (Michigan)
- Adrian (popes)
- Adrian de Castello
- Adriano di Castelo
- Adrianople
- Adrian’s Wall
- Adriatic Sea
- Adua
- Adrienne Lecouvreur
- Æcidiomycetes
- Æcidium
- Ædicula
- Ædiles
- Ædui
- Ægadian Islands
- Ægæon
- Ægagrus
- Ægean Sea
- Ægeon
- Ægeriidæ
- Ægeus
- Ægida, Ludwig Karl
- Ægidius
- Ægina
- Ægyptus
- Ælfric the Grammarian
- Ælfthryth
- Ælia Capitolina
- Ælia Gens
- Ælianus, Claudius
- Aëllo
- Aelst
- Aelst, Evert van
- Æluroidea
- Æmilia
- Æmilia Gens
- Æmilian Way
- Æmilius Paulus
- Æneas
- Æneas Silvius
- Æneid
- Ænesidemus
- Ænianes
- Ænon
- Æolian Accumulations
- Æolian Harp
- Æolian Isles
- Aëromancy
- Aëronautics
- Aëroplane
- Aërostatic Press
- Aërostatics
- Aërotropism
- Æschines
- Æschylus
- Affirmation in Lieu of an Oath
- Afghanistan
- Afinger, Bernhard
- Afiun-Kara-Hissar
- Afragola
- Afranius, Lucius
- Africa
- Africaine, L'
- Africander
- African Hair
- African International Association
- Afzelius, Arvid August
- Agades
- Agadir
- Agag
- Agagite
- Agalactia
- Agalmatolite
- Agama
- Agamedes
- Agamemnon
- Agamenticus, Mount
- Agamogenesis
- Agaña
- Aganippe
- Agao
- Agathon
- Agoult, Marie Catherine Sophie de Flayigny, Comtesse d'
- Agram
- Agramonte, Ignacio
- Agrapha
- Agraphia
- Agrarian Law
- Agrarian Movement
- Agrarian Party
- Agravaine, Sir
- Agreda, Maria (Coronel) de
- Agreement
- Agreement, Method of
- Agreement of the People, The
- Agricola, Christopher Ludwig
- Agricola, Georg
- Agricola, Gnæus Julius
- Agricola, Johann Friedrich
- Agricola, Johann
- Agricola, Martin
- Agricola, Rodolphus
- Agricultural Ant
- Agriculture
- Aguilera, Ventura Ruiz
- Aguinaldo, Emilio
- Aguirre, Lope de
- Aide-toi et le ciel t'aidera
- Ailsa Craig
- Aimak
- Aimara
- Aimard, Gustave
- Aimé-Martin, Louis
- Aimon
- Aimwell
- Ain (river)
- Ain (department)
- Ainemolo, Vincenzo
- Ainger, Alfred
- Ainmiller, Max Emanuel
- Aino, or Ainu
- Ainslie, Hew
- Ainsworth, Frederick Crayton
- Ainsworth, Henry
- Ainsworth, Robert
- Ainsworth, William Francis
- Ainsworth, William Harrison
- Aintab
- Air, or Asben
- Air
- Air Bladder of Fishes
- Air Brake
- Air Cells
- Air Compressor
- Air Cushion
- Aird, Thomas
- Airdrie
- Aire-sur-l’Adour
- Aire-sur-la-Lys
- Airedale Terrier
- Air Engine
- Air Gun
- Airolo
- Air Plant
- Air Port
- Air Pump
- Air Resistance of a Projectile
- Air Sacs
- Akyab
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- Al
- Alabama (river)
- Alabama (State)
- Alabama Claims
- Alabame State A&M College
- Alabaster
- Alabaster, William
- Alacoque, Marguerite Marie
- Alacranes
- Ala-dagh
- Aladdin
- Aladja Dágh
- Alagoas (city)
- Alagoas (state)
- Alai Mountains
- Alain de Lille
- Alais
- Alais, Peace of
- Alajuela
- Ala-kul
- Alalonga
- Alaman, Lucas
- Alamance, Battle of
- Alamanni
- Alamanni, Luigi
- Alamannia
- Alameda
- Alaminos, Antonio de
- Alamo, The
- Álamos
- Alan, William
- Alan-a-Dale
- Åland Islands
- Alani
- Alanus Ab Insulis
- Al-Araf
- Alarcón, Hernando de
- Alarcón, Pedro Antonio de
- Alarcón y Mendoza, Don Juan Ruiz de
- Alard, Jean Delphin
- Alaric
- Alaric II.
- Alarm (military)
- Alarm (contrivance)
- Alarodian
- Alary, Jules
- Alas, Leopoldo
- Alascans
- Alasco
- À Lasco
- Alashehr
- Alaska
- Alaska Sable
- Alassio
- Alastor
- Alatau
- Albany (Australia)
- Albany (New York)
- Albany (Oregon)
- Albany (Georgia)
- Albany (Missouri)
- Albany
- Albany, Duke of
- Albany, Duke of (Shakespeare)
- Albany, Louisa Maria Caroline
- Albany Convention of 1754
- Albany Regency, The
- Albategnius
- Albatross
- al-Battani, Mohammed ibn Jabir ibn Sinan
- Albuquerque (New Mexico)
- Albuquerque, Affonso de, The Great
- Alburnum
- Albury
- Alcæus
- Alcaics
- Alcott, Amos Bronson
- Alcott, Louisa May
- Alcott, May
- Alessandria
- Alessi, Galeazzo
- Ålesund
- Aleuromancy
- Aleurone
- Aleutian Islands
- Alewife
- Alexander the Great
- Alexander
- Alexander I. (King of Epirus)
- Alexander II. (King of Epirus)
- Alexander I. (Prince of Bulgaria)
- Alexander I., Pavlovitch
- Alexander II., Nikolayevitch
- Alexander III., Alexandrovitch
- Alexander I. (King of Scotland)
- Alexander II. (King of Scotland)
- Alexander III. (King of Scotland)
- Alexander I. (King of Servia)
- Alexander, Abraham
- Alexander, Archibald
- Alexander, Barton Stone
- Alexander, Edward Porter
- Alexander, George
- Alexander, James
- Alexander, James Edward
- Alexander, James Waddell
- Alexander, John Henry
- Alexander, John White
- Alexander, Joseph Addison
- Alexander, Legend of
- Alexander, Mrs.
- Alexander, Samuel
- Alexander, Stephen
- Alexander, Sir William, Earl of Stirling
- Alexander, William (American soldier)
- Alexander, William (archbishop)
- Alexander, William Lindsay
- Alexander Ætolus
- Alexander Archipelago
- Alexander Balas
- Alexander Column
- Alexander Falls
- Alexander Jannæus
- Alexander John I.
- Alexander Karageorgevitch
- Alexander Land
- Alexander Nevski
- Alexander of Aphrodisias
- Alexandrian Library
- Alexandrov
- Alexandrovsk
- Alexandrovsk-Grushevski
- Alexei Alexandrovitch
- Alexei Mikhailovitch
- Alexei Petrovich
- Alexians
- Alexis (sheperd)
- Alexis (dramatist)
- Alexis I. Comnenus
- Alexis II. Comnenus
- Alexis III. Angelus
- Alexis IV. Angelus
- Alexis V. Dukas Murtzuphlos
- Alexis Comnenus
- Alexis of Thurii
- Alexis, Willibald
- Alexisbad
- Alexius
- Alfa
- Alfred
- Al-Gazali, Abu Hamid Mohammed
- Algonquin
- Algorism
- Alguacil
- Alhagi
- Alhama (Andalusia)
- Alhama (Murcia)
- Alhambra
- Alhambra, The
- Alhazen
- Al-Henna
- Alhóndiga de Granaditas
- Ali ibn Abu Talib
- Alias
- Alilonghi
- al-Kindi, Abu Yusuf Ya‘ḳub ibn Isḥak
- Allen, David Oliver
- Allen, Ebenezer
- Allen, Edward Patrick
- Allen, Elisha Hunt
- Allen, Elizabeth Akers
- Alliance Israelite Universelle
- Alliance of the Reformed ...
- Alliaria
- Allibone, Samuel Austin
- Allice
- Almanac
- Almanach de Gotha
- Almandine
- Almansa
- Al-Mansur, Abu Ja‘Far Abdallah ibn Mohammed
- Alma-Tadema, Laurence
- Almaviva, Count
- Almeh
- Alpenhorn
- Alpes Basses
- Alpes Maritimes
- Alpetragius
- Alpha and Omega
- Alphabet
- Alphand, Jean Charles Adolphe
- Alpheus
- Alphonse
- Alphonsine Tables
- Alphonso
- Alphonsus Maria di Liguori
- Alphorn
- Alpine Clubs
- Alpine Plant
- Alpini, Prospero
- Alpinia
- Alps
- Alpujaras
- Al-Rakim
- Alredus
- Amalia, Anna
- Amalie, Marie
- Amalie, Marie Friederike
- Amalie, Marie Friederike Auguste
- Amama, Sixtinus
- Amana
- Amanda
- Amazon
- Amazonas (Peru)
- Amazonas (Brazilian State)
- Amazonite
- Amazons
- Ambrosian Library
- Amercement
- Ameria
- America
- America (hymn)
- America (yacht)
- American Allspice
- American Aloe
- American Institute
- Americanisms
- American Knights, Order of
- American Literature
- American Museum of Natural History
- American Notes
- American Party
- American River
- American Sycamore
- American System
- American University
- American Wine
- Americus
- Amerind
- Amerling, Friedrich
- Amersfoort
- Ames
- Ames, Fisher
- Ames, James Barr
- Ames, Joseph (1689-1759)
- Ames, Joseph (1816-1872)
- Ames, Joseph Sweetman
- Ames, Mary Clemmer
- Ames, Nathax P.
- Ames, Oakes
- Ames, Oliver
- Ames, William
- Amesbury
- Amethyst
- Ametecpia
- Amega
- Amhaba
- Amharic Language
- Amherst (Massachusetts)
- Amherst (Nova Scotia)
- Amherst, Jeffrey, Baron
- Amherst, William Pitt, Earl
- Amiens
- Amina
- Aminadab Sleek
- Amine
- Amines
- Aminta
- Aminte
- Amintor
- Amiot
- Amirante Islands
- Amis et Amiles
- Amish Church, The
- Amish Church, The Old
- Amistad Case, The
- Amite
- Amitosis
- Amityville
- Amlet, Dick
- Amleth
- Amphipoda
- Amphipolis
- Amphisbæna
- Amphissa
- Amphitheatre
- Amphitrite
- Amphitruo
- Amphitryon (Plautus play)
- Amphitryon (mythical)
- Amphitryon (arts)
- Amphitryon, or the Two Socias
- Amphiuma
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- Anabaptists
- Anarchist
- Anastasia
- Anastasia, Saint
- Anastasia the Younger
- Anastasius I.
- Anastasius II.
- Anastasius (popes)
- Anastasius the Librarian (Bibliothecarius)
- Anastomosis
- Anastase
- Anathema
- Anathoth
- Anatidæ
- Anatolia
- Andes
- Andria (city)
- Andria (comedy)
- Andrieux, François Guillaume Jean Stanislaus
- Andriscus
- Androclus
- Androgynous
- Andromache (mythology)
- Andromache (play)
- Andromaque
- Andromeda (mythology)
- Andromeda (plant)
- Andromeda (constellation)
- Andronicus (emperors)
- Andronicus (Cyrrhestes)
- Andronicus of Rhodes
- Andronicus, Livius
- Andronicus, Titus
- Anemone
- Anemone, Sea
- Anemophilous Plants
- Anemoscope
- Aner
- Anerio, Felice
- Angelica (plant)
- Angelica (in literature)
- Angelica Tree
- Angelic Doctor, The
- Angelic Hymn
- Angelico, Fra
- Angelic Salutation
- Angelina
- Angélique
- Angle, Facial
- Angle Iron
- Angle of Elevation
- Angler
- Angles
- Anglesea
- Anglesey
- Anglesey, Henry William Paget
- Anglesite
- Angleworm
- Anglia, East
- Anglican
- Anglican Church
- Anglican Communion
- Anglin, Margaret
- Anna Comnena
- Anna Ivanovna
- Anna Karenina
- Anna Karlovna
- Annapolis (Maryland)
- Annapolis Convention, The
- Ann Arbor
- Annarr
- Annas
- Annates
- Anquetil, Louis Pierre
- Anquetil Duperron, Abraham Hyacinthe
- Ansaries
- Ansbach
- Anschütz, Heinrich
- Anschütz, Karl
- Anschütz, Ottomar
- Ansgar
- Ant
- Antacids
- Antæ
- Antæus
- Antakiyeh
- Antalcidas
- Antanaclasis
- Antananarivo
- Antar, ibn Shaddad al-Absi
- Antarctic Current, Lands, Ocean
- Antarctic Region
- Antares
- Ant-bear
- Ant-bird
- Ant-eater
- Antediluvian
- Antedon
- Antefix
- Antelami, Benedetto]
- Antelope
- Anthony, Henry Bowen
- Anthony, John Gould
- Anthony, Susan Brownell
- Anthony, William Arnold
- Anti-Federalists
- Anti-Jacobin, The
- Anti-Jacobin Review, The
- Antilegomena
- Anti-Libanus
- Antilles
- Antilocapra
- Antilogarithm
- Anti-Machiavel
- Antimachus
- Anti-Masons
- Antinori, Marchese Orazio
- Antinoüs
- Antioch
- Antioch, Principality of
- Antioch College
- Antiochian School
- Antiochus
- Antiochus I. Soter
- Antiochus II. Theos
- Antiochus III. the Great
- Antiochus IV. Epiphanes
- Antiochus V. Eupator
- Antiochus VI. Theos
- Antiochus VII. Sidetes
- Antiochus VIII. Grypus
- Antiochus IX. Cyzicenus
- Antiochus X. Eusebes
- Antiochus XI.Epiphanes
- Antiochus XII. Dionysus
- Antiochus XIII. Asiaticus
- Antiochus Hierax
- Antiochus of Askalon
- Antiope
- Antioquia
- Antipædobaptists
- Antiparallels
- Antiparos
- Antipas
- Antipater
- Antipathy
- Antipatris
- Antiphanes
- Antiphilus
- Antiphon (breviary)
- Antiphon (orator)
- Antiphon (mathematician)
- Antiphony
- Antiphrasis
- Antipodes
- Antipodes Island
- Antipope
- Antipyretic
- Antipyrine
- Antiquarian Societies
- Antiquarian Society, American
- Antiquary, The
- Antique
- Antiquities
- Anti-rentism
- Antirrhinum
- Anti-Semitism
- Antiseptic
- Antislavery Society, The American
- Antoninus and Faustina, Temple of
- Antoninus Liberalis
- Antoninus Pius
- Antonio
- Antonio, Nicolas
- Antonio de Sedilla
- Antonius, Gaius
- Antonius, Marcus (Roman lawyer)
- Antonius, Marcus (Roman triumvir)
- Antonius, St.
- Antonomasia
- Anton Ulric
- Antony, St., of Thebes
- Antony, St., of Padua
- Antony and Cleopatra
- Ant Plants
- Apayao
- Ape
- Apeak
- Apel, Johann August
- Apeldorn
- Apelles
- Apelt, Ernst Friedrich
- Apemantus
- Apocrypha
- Apocynaceæ
- Apocynum (genus)
- Apocynum (drug)
- Apodes
- Apodictic
- Apostle
- Apoya
- Appalachian Mountain Club
- Appalachians
- Appert, Benjamin Nicolas Marie
- Appert, François
- Appetite
- Appiani, Andrea
- Appianus
- Appian Way
- Appius, Market of
- Appius and Virginia
- Appius Claudius Crassus
- Apple
- Apple Brandy
- Apple of Discord
- Apple of Sodom
- Apple Shell
- Apple Snail
- Appleton
- Appleton, Charles Edward
- Appleton, Daniel
- Appleton, George Swett
- Appleton, James
- Appleton, Jesse
- Appleton, John
- Appleton, John Howard
- Appleton, Nathan
- Appleton, Samuel
- Appleton, Thomas Gold
- Appleton, William Henry
- Apthorp, William Foster
- Aquatic Plants
- Aquatint
- Aquila, Johann Kasper
- Aquila, Ponticus
- Arabian Nights
- Arabic Language and Literature
- Arakan
- Araucania
- Araucan Stock
- Araucaria
- Arauco
- Araujo de Azevedo, Antonio de
- Araujo Porto-Alegre, Manoel de
- Arauna
- Araure
- Aravulli
- Arawak
- Arboleda, Julio
- Arbor Day
- Arbor Dianæ
- Arboretum
- Arboriculture
- Arbor Vitæ
- Arbroath
- Arbués, Pedro
- Arbuthnot, John
- Arbuthnot, Marriot
- Arbutus
- Arbutus, Trailing
- Arc, Electric
- Arc, Joan of
- Arcachon
- Arcade
- Arcadelt, Jacob
- Arcades
- Arcadia (region)
- Arcadia (pastoral romance)
- Arcadius
- Arcani Disciplina
- Arcanum, The Great
- Arc de Triomphe de l'Etoile
- Arc de Triomphe du Carrousel
- Arce, Francisco
- Arcesilaus
- Arch
- Arch, Triumphal or Memorial
- Arch, Joseph
- Archæan System
- Archæological Institute of America
- Archæology
- Archæology, American
- Archimedes, The Principle of
- Archipelago
- Architects, American Institute of
- Architecture
- Architecture, Ancient American
- Architrave
- Archives
- Archivolt
- Archlute
- Arch of Arcadius, Honorius and Theodosius
- Arch of Augustus
- Arch of Claudius
- Arch of Constantine
- Arch of Drusus
- Arch of Hadrian
- Arch of Janus Quadrifrons
- Arch of Septimius Severus
- Arch of Titus
- Arch of Trajan
- Archon
- Arch-priest
- Archway
- Archytas
- Archytas of Amphissa
- Arcifera
- Arcis-sur-Aube
- Arcite
- Arc Lamps and Arc Lighting
- Arco, Carlo d’
- Arco dei Leoni
- Arco della Pace
- Arcole
- Arçon, Jean Claude d’
- Arcona
- Arcos de la Frontera
- Arcosolium
- Arcot
- Arctic
- Arctic Current, Highlands
- Arctic Discovery
- Arctic Ocean
- Arctic Plants
- Arctic Region
- Arctium
- Arctoidea
- Arctostaphylos
- Arcturus
- Arcuation
- Arcueil
- Arcus Senilis
- Arents, Albert
- Argall, Samuel
- Argenson, Marc René de Voyer d’
- Argenson, Marc René, Marquis d’
- Argenson, René Louis de Voyer, Marquis d’
- Argent
- Argenteuil
- Argenteus Codex
- Argentina
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