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Search by letter: A
- Aurouër: Commune in Allier, Central France Aurouër
- Aurseulles (Calvados) — commune in Normandy, France Aurseulles
- Ausangate — High mountain of the Vilcanota Andes Ausangate
- Auschwitz: Nazi concentration, forced-labor and extermination complex Auschwitz concentration camp
- Auslikon — village in the municipality of Pfäffikon, canton of Zurich Auslikon
- Ausonius (Decimus Magnus Ausonius) — Late Roman poet and rhetorician Ausonius
- Ausserberg — Mountain municipality in Valais, Switzerland Ausserberg
- Ausserferrera — Alpine village in Graubünden, Switzerland Ausserferrera
- Aussersihl, District 4 of Zürich — overview, history and character Aussersihl
- Aussevielle
- Aussurucq — rural commune in the Basque foothills of southwestern France Aussurucq
- Austen Chamberlain: British statesman and Nobel Peace Prize laureate Austen Chamberlain
- Austenite — the gamma phase of iron and its role in steels Austenite
- Austerity (fiscal policy) Austerity
- Austin & Ally (Disney Channel sitcom) Austin & Ally
- Austin Asche: Australian jurist and Northern Territory administrator Austin Asche
- Austin Butler
- Austin City Limits (American television music series) Austin City Limits
- Austin City Limits Music Festival
- Austin Clarke
- Austin County, Texas — overview, history, and local profile Austin County, Texas
- Austin Deasy
- Austin Dillon
- Austin Eubanks: Columbine survivor, addiction advocate, and his legacy Austin Eubanks
- Austin Mahone — American pop singer-songwriter Austin Mahone
- Austin Motor Company
- Austin Peay State University
- Austin Pendleton
- Austin Petersen: Libertarian Activist, Commentator, and Political Candidate Austin Petersen
- Austin Powers (character)
- Austin Powers in Goldmember — 2002 satirical spy comedy film Austin Powers in Goldmember
- 2018 Austin serial bombings Austin serial bombings
- Austin (Chicago community area) Austin, Chicago
- Austin, Colorado — unincorporated community in Delta County Austin, Colorado
- Austin, Minnesota
- Austin, Texas
- Austis — town and comune in the Province of Nuoro, Sardinia Austis
- Auston Matthews — American NHL center for the Toronto Maple Leafs Auston Matthews
- Australasia: geography, ecology, history and distinctions Australasia
- Australasia Olympic Team (1908–1912): Joint Australia and New Zealand Delegation Australasia at the Olympics
- Australasian realm: geography, biodiversity, and biogeographic history Australasian realm
- Australia (Commonwealth of Australia) Australia
- Australia (2008 film) Australia (2008 movie)
- Australia (continent): Sahul, Meganesia and the Australian landmass Australia (continent)
- Australia Act 1986: final legal severance from the United Kingdom Australia Act 1986
- Australia at the 2018 Winter Paralympics in Pyeongchang Australia at the 2018 Winter Paralympics
- Australia at the Olympics: history, achievements and legacy Australia at the Olympics
- Australia Day: History, observance, and contemporary perspectives Australia Day
- Australia men's national soccer team (the Socceroos) Australia men's national soccer team
- Australia national cricket team
- Australia national rugby union team (Wallabies) Australia national rugby union team
- Australia national rugby union team (the Wallabies) Australia national rugby union team
- Australia's Next Top Model
- Australia's Next Top Model — Cycle 5 (2009) Australia's Next Top Model (season 5)
- Australia's Next Top Model Cycle 4 (2008): contestants, format and winner Australia's Next Top Model, Cycle 4
- Australia's Next Top Model — Cycle 7 (2011) Australia's Next Top Model, Cycle 7
- Australian Aboriginal astronomy: sky knowledge, traditions, and uses Australian Aboriginal astronomy
- Australian Aboriginal mythology (Dreaming and Songlines) Australian Aboriginal mythology
- Australian Academy of Science
- Australian Antarctic Territory
- Australian Broadcasting Corporation (ABC) — Australia's national public broadcaster Australian Broadcasting Corporation
- Australian Bureau of Statistics
- Australian Canadians
- Australian Capital Territory (ACT) Australian Capital Territory
- Australian cinema: history, themes, and notable films Australian cinema
- Australian Classification Board: role, ratings, history and processes Australian Classification Board
- Australian Convict Sites — World Heritage ensemble Australian Convict Sites
- Australian Country Alliance
- Australian country music: origins, sounds, themes and notable artists Australian country music
- Australian Defence Force
- Australian dollar (AUD) Australian dollar
- Australian Electoral Commission (AEC) Australian Electoral Commission
- Australian English: Overview, Features, History and Varieties Australian English
- Australian Film Institute Awards (AACTA Awards) Australian Film Institute Awards
- Australian Football League (AFL) Australian Football League
- Australian gold rushes (mid-19th century to 1890s) Australian gold rushes
- Australian Grand Prix
- Australian green tree frog (Litoria caerulea) Australian green tree frog
- Australian Greens
- Australian House of Representatives
- Australian impact structure (MAPCIS) — proposed megacrater in central Australia Australian impact structure
- Australian Indian Ocean Territories
- Australian Kelpie
- Australian Labor Party (ALP) Australian Labor Party
- Australian Labor Party (Anti-Communist)
- Australian Labor Party (NSW) — Lang Labor (1931–1936) Australian Labor Party (NSW)
- Australian literature: origins, themes, forms and notable writers Australian literature
- Australian megafauna: giant prehistoric animals of Pleistocene Australia Australian megafauna
- Australian Mist (cat breed) Australian Mist
- Australian Music Online (government music portal, 2003–2007) Australian Music Online
- Australian Music Prize (The AMP) Australian Music Prize
- Australian National Botanic Gardens
- Australian National University (ANU) Australian National University
- Australian of the Year
- Australian Open: Overview, History, Surfaces and Significance Australian Open
- Australian Overland Telegraph Line
- Australian Plains (South Australia) Australian Plains
- Australian Plant Name Index (APNI) Australian Plant Name Index
- Australian pound (1910–1966) Australian pound
- Australian Recording Industry Association (ARIA) Australian Recording Industry Association
- Australian Rules Football: Rules, Play Style, and Cultural Significance in Australia Australian rules football
- Australian Senate (Upper House of the Parliament) Australian Senate
- Australian Shield (Western Plateau) Australian Shield
- Australian Sports Medal
- Australian War Memorial It recognises all members of the armed forces
- Australians for Constitutional Monarchy
- Australidelphia — superorder of Australasian marsupials Australidelphia
- Australoid (historical racial classification) Australoid (race)
- Australopithecine — early bipedal hominins of the Pliocene and Pleistocene Australopithecine
- Australopithecus — Early bipedal hominins of Africa Australopithecus
- Australopithecus afarensis — an early bipedal hominin Australopithecus afarensis
- Australopithecus africanus: early South African hominin Australopithecus africanus
- Australopithecus anamensis: early Pliocene hominin from East Africa Australopithecus anamensis
- Australopithecus bahrelghazali: the Chad hominin 'Abel' and its significance Australopithecus bahrelghazali
- Australopithecus garhi — a Pliocene australopith from Bouri, Ethiopia Australopithecus garhi
- Australosphenida
- Australovenator — Australian Cretaceous theropod Australovenator
- Austria: Central European republic — geography, history, culture and government Austria
- Austria at the 2018 Winter Paralympics
- Austria at the Olympic Games Austria at the Olympics
- Austria national football team
- Austria-Hungary (Austro-Hungarian Empire): history, structure and legacy Austria-Hungary
- Austrian Airlines
- Austrian Cup (ÖFB-Cup) Austrian Cup
- Austrian Empire (1804–1867): Habsburg monarchy, political evolution and territorial legacy Austrian Empire
- Austrian Football Association (ÖFB) Austrian Football Association
- Austrian Football Bundesliga a football league which is top division in Austria
- Austrian Grand Prix Formula One motor race
- Austrian Hockey League (Erste Bank Eishockey Liga) Austrian Hockey League
- Austrian People's Party (ÖVP) Austrian People's Party
- Regionalliga West (Austria) Austrian Regionalliga West
- Austrian School of Economics Austrian School
- Austrian Sign Language (ÖGS) Austrian Sign Language
- Austrian State Treaty (1955): Restoration of Austria's Independence Austrian State Treaty
- Austro‑Bavarian (Bairisch): an overview of the Upper German dialect group Austro-Bavarian language
- Austro-Hungarian Compromise of 1867 (Ausgleich / Kiegyezés) Austro-Hungarian Compromise of 1867
- Austroasiatic languages: overview, classification and significance Austroasiatic languages
- Austrobaileyales
- Austronesian languages
- Austronesian peoples: distribution, origins, and cultural legacy Austronesian peoples
- Austwell, Texas
- Auswil — municipality in the canton of Bern, Switzerland Auswil
- Autafond — former municipality in the canton of Fribourg, Switzerland Autafond
- Autarky: Economic Self-Sufficiency and Closed Economies Autarky
- Autauga County, Alabama: overview, history, and community profile Autauga County, Alabama
- Autaugaville, Alabama: small town profile and community overview Autaugaville, Alabama
- Autavaux — village in the district of Broye, canton of Fribourg Autavaux
- Auterrive — commune in Pyrénées-Atlantiques, France Auterrive
- Autevielle-Saint-Martin-Bideren
- Authentication: verification of identity, origin, and trust Authentication
- Autheux (Somme) Autheux
- Authie, Calvados — a rural commune in Normandy, France Authie, Calvados
- Authie, Somme — commune in Hauts-de-France Authie, Somme
- Authieule — small commune in the Somme department of Hauts-de-France Authieule
- Authon (Alpes-de-Haute-Provence): commune, landscape and local life Authon, Alpes-de-Haute-Provence
- Author: meaning, roles, and legal and cultural contexts Author
- Authority: Concepts, Forms, History, and Social Role Authority
- Authorization for Use of Military Force Against Terrorists (2001) Authorization for Use of Military Force Against Terrorists
- Authorized King James Version (King James Bible) Authorized King James Version
- Authors Guild
- Authors of the Bible: traditions, composition, and scholarly perspectives Authors of the Bible
- Authuille (Somme commune, Hauts-de-France) Authuille
- Autigny, Fribourg, Switzerland Autigny, Switzerland
- Autingues: commune in Pas-de-Calais, northern France Autingues
- Autism (Autism Spectrum Disorder) Autism
- Autism rights movement and the neurodiversity perspective Autism rights movement
- Autism Speaks
- Autism spectrum (Autism Spectrum Disorder) Autism spectrum
- Autism Spectrum Quotient (AQ) — screening questionnaire for autistic traits Autism Spectrum Quotient
- Auto: meanings, origins, and common uses Auto
- Auto Club 400 (NASCAR Cup Series race) Auto Club 400
- Auto Club Speedway
- Auto mechanic: roles, skills, history and common tasks Auto mechanic
- Auto racing (motorsport) Auto racing
- Auto-Tune: automatic pitch correction and the vocal effect Auto-Tune
- Autobahn: Germany's controlled-access highway system Autobahn
- Autobiography: Definition, History, Structure, and Uses Autobiography
- Autobiography of Mark Twain
- Autocephaly (self-governance of Christian churches) Autocephaly
- Autoclave: Steam Sterilization and Industrial Pressure Vessels Autoclave
- Autocracy: Overview, Types, and Historical Examples Autocracy
- Autodefensas Unidas de Colombia: origins, structure, and legacy Autodefensas Unidas de Colombia
- Autodidact: Self-directed learning and its history, methods, and significance Autodidact
- Autodromo Enzo e Dino Ferrari (Imola) Autodromo Enzo e Dino Ferrari
- Autódromo Hermanos Rodríguez
- Autódromo José Carlos Pace (Interlagos) Autódromo José Carlos Pace
- Autodromo Nazionale Monza
- Autofellatio: definition, physiology, cultural history and considerations Autofellatio
- Autofocus: principles, methods, and applications of automatic focusing systems Autofocus
- Autograph
- AutoHotkey — Windows scripting language for hotkeys, macros and automation AutoHotkey
- Autoimmune disease
- Autoimmunity: causes, mechanisms, common conditions, diagnosis and treatment Autoimmunity
- AutoIt: Windows scripting and GUI automation language AutoIt
- Autolycus of Pitane — Hellenistic Astronomer and Mathematician Autolycus of Pitane
- Automata theory: abstract machines, formal languages, and computation Automata theory
- Automated external defibrillator
- Automated Teller Machine (ATM): Functions, History, Security, and Uses Automated teller machine
- Automatic behaviour
- Automatic firearm
- Automatic rifle
- Automatic train operation: systems, levels, history and uses Automatic train operation
- Automation: concept, components, history, uses and societal impacts Automation
- Automaton: abstract machines, finite-state models, and applications Automaton
- Automeris io (Io moth): appearance, life cycle, range and defenses Automeris io
- Automobile (Car): Overview, Parts, History, and Uses Automobile
- Dacia (automobile manufacturer) Automobile Dacia
- Automobili Turismo e Sport (ATS): Italian sports-car maker and brief F1 entrant Automobili Turismo e Sport
- Automotive industry: history, structure, and modern trends Automotive industry
- Automotive lighting systems Automotive lighting
- Autonoe (Jupiter XXVIII) Autonoe (moon)
- Autonomic nervous system — control of internal organs and homeostasis Autonomic nervous system
- Autonomous communities of Spain
- Autonomous consumption: definition, role in the consumption function, and policy relevance Autonomous consumption
- Autonomous Province of Kosovo and Metohija
- Autonomous Region in Muslim Mindanao (former autonomous region of the Philippines) Autonomous Region in Muslim Mindanao
- Autonomous Region of Bougainville
- Autonomous regions of China: purpose, structure, and examples Autonomous regions of China
- Autonomous republic
- Autonomy: concept, forms, history, and practical significance Autonomy
- Autophagy: cellular self-digestion, mechanisms, and biological roles Autophagy
- Autopoiesis: self-producing systems and biological self‑maintenance Autopoiesis
- Autopsy: Medical and Forensic Post‑Mortem Examination Autopsy
- Autotransplantation: definition, techniques, uses and history Autotransplantation
- Autotroph
- Autrans — village and ski center on the Vercors plateau (Isère, France) Autrans
- Autremencourt — Small commune in Aisne, northern France Autremencourt
- Autreppes — a commune in Aisne, northern France Autreppes
- Autreville, Aisne
- Autry-Issards: French commune in the Allier department Autry-Issards
- Autumn (Fall): Season, Characteristics, Ecology and Cultural Roles Autumn
- Autumn (Dutch gothic metal band) Autumn (band)
- Autumn Leaves (1956 film) Autumn Leaves
- Autumn Reeser — American actress known for television and film roles Autumn Reeser
- Autumn Sonata (1978 film) Autumn Sonata
- Auty — commune in Tarn-et-Garonne, southern France Auty
- Auufer — municipality in Steinburg, Schleswig‑Holstein, Germany Auufer
- Auvare — commune in Alpes-Maritimes, Provence-Alpes-Côte d'Azur Auvare
- Auvergne — historical region of central France Auvergne
- Auvergne-Rhône-Alpes — administrative region of France Auvergne-Rhône-Alpes
- Auvernier — village and former municipality in Neuchâtel, Switzerland Auvernier
- Auvers-le-Hamon
- Auvers-sous-Montfaucon (commune in Sarthe) Auvers-sous-Montfaucon
- Auvillars (Calvados) — Commune in Normandy, France Auvillars
- Auw, Aargau
- Auxerre: historic prefecture and riverside town in Burgundy, France Auxerre
- Auxi-le-Château — a historic commune in Pas-de-Calais Auxi-le-Château
- Auxiliary (supporting roles and systems) Auxiliary
- Auxiliary Sciences of History
- Auxiliary verb
- Auxin: Plant Growth Regulators and Their Roles in Development Auxin
- Auxon, Aube — a rural commune in north-central France Auxon, Aube
- Auzay — former commune in Vendée, Pays de la Loire Auzay
- Auzet — mountain commune in Alpes-de-Haute-Provence, France Auzet
- Ava Gardner: Hollywood actress and mid‑20th century screen icon Ava Gardner
- Ava, Illinois — small village in southern Illinois Ava, Illinois
- Avadi — Chennai suburb and defence-industrial hub Avadi
- Avadi Railway Station — suburban rail hub in Chennai's west Avadi Railway Station
- Avago (UK television channel) Avago (TV channel)
- Avaí Futebol Clube — Brazilian football club from Florianópolis Avaí FC
- Availability (computing and information security) Availability
- Avalanche: Causes, Types, Hazards and Safety Avalanche
- Avalanche effect (cryptography) Avalanche effect
- Avallon — historic subprefecture in Yonne, Bourgogne-Franche-Comté Avallon
- Avalon (mythology)
- Avalon (song)
- Avalon Park, Chicago
- Avalon Peninsula: geography, history and significance Avalon Peninsula
- Avan Jogia
- Avant-garde: Experimental and Innovative Movements in Art, Culture and Politics Avant-garde
- Avant-garde music
- Avant-lès-Marcilly
- Avant-lès-Ramerupt
- Avant, Oklahoma — small town in Osage County Avant, Oklahoma
- Avanti! (1972 film) Avanti!
- Avar language: overview, characteristics, distribution and status Avar language
- Avarua — capital town and district on Rarotonga, Cook Islands Avarua
- Avatar: concept, forms, and cultural significance in Hinduism and beyond Avatar
- Avatar (2009 film) Avatar (2009 movie)
- Avatar Airbender — Nickelodeon Universe roller coaster Avatar Airbender
- Avebury: Neolithic henge, stone circles and World Heritage site Avebury
- Avegno Gordevio — Municipality in Vallemaggia, Ticino Avegno Gordevio
- Avegno, Ticino — Former municipality in Vallemaggia, Switzerland Avegno, Switzerland
- Aveiro, Portugal: the lagoon city known for canals, moliceiros and ovos moles Aveiro, Portugal
- Avelesges: a commune in the Somme, Hauts-de-France Avelesges
- Avelgem, West Flanders (Belgium) Avelgem
- Avellino (Campania, Italy) Avellino
- Aveluy — commune in the Somme department, Hauts-de-France Aveluy
- Avemetatarsalia — bird-line archosaurs (Panaves) Avemetatarsalia
- Avenay, Calvados (commune in Normandy) Avenay
- Avenches — Swiss town with Roman roots (Aventicum) and modern municipality Avenches
- Avenches District (former), Canton of Vaud, Switzerland Avenches (district)
- Avenel, Victoria: Overview, history, community and transport Avenel, Victoria
- Avenged Sevenfold
- Avensan — commune in Gironde, Nouvelle-Aquitaine, France Avensan
- Aventura (Dominican-American bachata group) Aventura
- Aventura, Florida: Overview, history, attractions and local profile Aventura, Florida
- Avenue Franklin Roosevelt — prestigious boulevard in Ixelles, Brussels Avenue Franklin Roosevelt
- Average (mean, median, mode): Concepts, types, and uses Average
- Averdoingt — commune in Pas-de-Calais, northern France Averdoingt