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Questions and answers
- Aaron Ramsey — Welsh midfielder and international footballer Aaron Ramsey
- Aaron Sherritt: Informant, Outlaw Associate, and Catalyst in the Kelly Gang Story Aaron Sherritt
- Ab Anar (Marvdasht) — village in Fars Province, Iran Ab Anar, Marvdasht
- Ab Anar, a village in Arzhan District, Shiraz County Ab Anar, Shiraz
- Ab Anarak — village in Neyriz County, Fars Province, Iran Ab Anarak
- Ab Anbar-e Jahad Ashayiri
- AB III — third studio album by Alter Bridge AB III
- Abacus: history, design, and uses of the manual calculating frame Abacus
- Abalone — Haliotis sea snails: shells, biology, culinary use, and conservation Abalone
- ABBA — Swedish pop group and cultural legacy ABBA
- Abbasid Caliphate
- Abbeville — commune in the Somme department of Hauts-de-France Abbeville
- Abbeville, Alabama
- Abbey Road Studios: London's Historic Recording Studios Abbey Road Studios
- Abbie Hoffman: American counterculture activist and Yippie leader Abbie Hoffman
- Abbotsford, Wisconsin
- Abbott, Texas
- Abbreviation: forms, uses, and how it differs from acronyms Abbreviation
- Abby and Brittany Hensel — American dicephalic conjoined twins Abby and Brittany Hensel
- ABC Kids (ABC television programming block) ABC Kids (TV programming block)
- Abd al‑Rahman al‑Sufi (Azophi) — Persian Astronomer and Author of the Book of Fixed Stars Abd al-Rahman al-Sufi
- Abdalá Bucaram — Ecuadorian politician and former president Abdalá Bucaram
- Abderrahmane Hammad — Algerian Olympic high jumper Abderrahmane Hammad
- Abdication: relinquishing a throne or other high office Abdication
- Abdominal migraine
- Abduction (criminal law): definition, elements, and distinctions Abduction
- Abdul Ali Mazari — Hazara leader and head of Hezb-e Wahdat Abdul Ali Mazari
- Abdul Qadir Gilani: Life, Teachings and the Qadiriyya Sufi Order Abdul Qadir Gilani
- Tuanku Abdul Rahman: First Yang di-Pertuan Agong of Malaya Abdul Rahman of Negeri Sembilan
- Abdülaziz: Ottoman Sultan (1830–1876) — reign, reforms, and legacy Abdülaziz
- Abdullah Öcalan: founder and longtime leader of the Kurdistan Workers' Party (PKK) Abdullah Öcalan
- Abdus Salam — Pakistani theoretical physicist and Nobel laureate Abdus Salam
- Abe Vigoda — American character actor best known for The Godfather and Barney Miller Abe Vigoda
- Abel (biblical figure) Abel
- Abel Pardo
- Abel Tasman: Dutch navigator who first sighted Tasmania and New Zealand Abel Tasman
- Abelardo Montalvo — Acting President of Ecuador (1933–1934) Abelardo Montalvo
- Abelisaurus: a fragmentary abelisaurid theropod from South America Abelisaurus
- Abell 2029: A Massive Galaxy Cluster in Virgo Abell 2029
- Abell 2142 — a massive, X‑ray bright merging galaxy cluster Abell 2142
- Abenaki language
- Abercrombie: places, surname, and brands Abercrombie
- Aberdeen, Scotland Aberdeen
- Aberdeen Airport (Scotland) Aberdeen Airport
- Aberdeen F.C.: history, stadium, achievements and rivalries Aberdeen F.C.
- Abhimanyu — Young warrior of the Mahabharata Abhimanyu
- Abhisit Vejjajiva: Thai politician and former prime minister Abhisit Vejjajiva
- Abigail Fillmore (1798–1853): educator, First Lady, and White House librarian Abigail Fillmore
- Abigail Spencer
- Abilene Ruff Riders (indoor football team) Abilene Ruff Riders
- Abilene, Kansas city in Dickinson County
- Abkhazia: geography, political status, and modern history Abkhazia
- Ableism: causes, forms, history, and responses Ableism
- Abnormal Psychology: Study of Unusual Behavior and Mental Disorders Abnormal psychology
- Aboriginal art: traditions, materials, history and contemporary significance Aboriginal art
- Aboriginal Land Trust (Australia): purpose, law, and functioning Aboriginal Land Trust
- Abortion: definitions, types, methods, legal context and health considerations Abortion
- About a Girl (Canadian TV series) About a Girl (TV series)
- Above Mean Sea Level (AMSL): definition, measurement, and uses Above mean sea level
- Abraham de Moivre: life and mathematical contributions Abraham de Moivre
- Abraham Lincoln — 16th President of the United States and leader during the Civil War Abraham Lincoln
- Abraham Lincoln Presidential Library and Museum
- Abraham 'Grampa' Simpson — character profile Abraham Simpson
- Abrahamic religions: origins, beliefs, and traditions Abrahamic religions
- Abraham's Well International Visitors Center, Beersheba Abrahams Well International Visitors Center
- Abram Games — British graphic designer (1914–1996) Abram Games
- Abrictosaurus — Early Jurassic heterodontosaurid from southern Africa Abrictosaurus
- ABS-CBN — Philippine broadcaster: history, operations, and influence ABS-CBN
- Abscess (medical condition): causes, symptoms, diagnosis, and treatment Abscess
- Absheron Economic Region — Azerbaijan's eastern industrial and energy hub Absheron Economic Region
- Absinthe: origins, composition, culture, bans, and modern revival Absinthe
- Absolute monarchy: definition, features, history and modern relevance Absolute monarchy
- Absolute threshold of hearing
- Absolute zero: concept, physical meaning, experiments and practical effects Absolute zero
- Absorption (physical and chemical processes) Absorption
- Abstinence: Voluntary restraint from pleasurable activities Abstinence
- Abstraction: definition, types, history, and practical uses Abstraction
- Abu Dawud: 9th‑Century Hadith Scholar and Compiler of Sunan Abu Dawud Abu Dawud
- Abu Dhabi Grand Prix
- Abu Simbel temples: rock-cut monuments of Ramesses II Abu Simbel temples
- Abydos King List list of 76 kings of Ancient Egypt
- Abyss (wrestler)
- AC Cobra: British roadster with American V‑8 — history, design, variants and legacy AC Cobra
- AC Mogadiscio — Italian community football club in Mogadishu AC Mogadiscio
- AC Sparta Prague — leading Czech football club AC Sparta Prague
- Acacia baileyana (Cootamundra wattle): description, origin, uses and impacts Acacia baileyana
- Academic degree: purpose, types, and international practices Academic degree
- Academic Ranking of World Universities (ARWU) — Shanghai Ranking Academic Ranking of World Universities
- Académie de l'air et de l'espace (AAE) — French air and space academy Académie de l'air et de l'espace
- Academy Award for Animated Short Film
- Academy Award for Best Actor one of the Academy Awards of Merit
- Academy Award for Best Animated Feature
- Academy Award for Best Costume Design one of the Academy Awards of Merit
- Oscar for Best Directing: criteria, history, and impact on filmmakers Academy Award for Best Director
- Academy Award for Best Documentary (Short Subject)
- Academy Award for Best Documentary Feature
- Academy Award for Best Film Editing
- Academy Award for Best Makeup and Hairstyling
- Academy Award for Best Original Song
- Academy Award for Best Picture
- Academy Award for Best Picture
- Academy Award for Best Picture
- Academy Award for Best Picture
- Academy Award for Best Picture
- Academy Award for Best Picture Oscars
- Academy Award for Best Picture
- Academy Award for Best Picture
- Academy Award for Best Picture
- Academy Award for Best Picture Oscars
- Academy Award for Best Production Design
- Academy Award for Best Supporting Actor
- Academy Award for Best Supporting Actress is one of the Academy Awards of Merit
- Academy of Sciences and Arts of Bosnia and Herzegovina (ANUBiH) Academy of Sciences and Arts of Bosnia and Herzegovina
- Academy of the Hebrew Language
- Acanthocephala — thorny‑headed (spiny‑headed) parasitic worms Acanthocephala
- Acanthopholis — an armored Early Cretaceous dinosaur Acanthopholis
- Acanthostega, an Early Devonian fishapod Acanthostega
- Surgeonfishes and Tangs (Acanthuridae): Reef Grazers with Blade-like Caudal Spines Acanthuridae
- Acanthuroidei
- Acarina (Acari): Mites and Ticks — Biology, Diversity and Impact Acarina
- Acastus — Greek mythological hero, Argonaut and king of Iolcus Acastus
- Acceleration (physics) Acceleration
- Acceleration due to gravity
- Accent — regional and personal patterns of pronunciation Accent
- Accident: causes, types, consequences and prevention Accident
- Accipitridae: overview of diurnal birds of prey Accipitridae
- Accipitriformes — the diurnal birds of prey: hawks, eagles and vultures Accipitriformes
- Accompaniment (music): roles, types, history and practice Accompaniment
- Accounting: Principles, Financial Statements, History and Applications Accounting
- Accra — Capital and Largest City of Ghana Accra
- Accuracy and precision
- Accusative case
- Ace Attorney (Gyakuten Saiban): courtroom adventure visual novel series Ace Attorney
- Ace Bailey — Canadian NHL right winger and beneficiary of the first All-Star benefit Ace Bailey
- Ace Books
- Aceh: northernmost province of Sumatra with distinct history and resources Aceh
- Acephalgic migraine (silent migraine): overview, features, and care Acephalgic migraine
- Acetonitrile (MeCN): Properties, Production, Uses, and Safety Acetonitrile
- Acetylide (C2^(2-)): structure, preparation, and uses Acetylide
- Achaemenid Empire (c. 550–330 BC) Achaemenid Empire
- Achernar (Alpha Eridani): the rapid-rotating blue star at the end of Eridanus Achernar
- Achilles: Greek hero of the Trojan War and enduring cultural figure Achilles
- Achondroplasia: genetic disorder causing short-limbed short stature Achondroplasia
- Acid — definition, properties, examples, and uses Acid
- Acid rain: causes, chemistry, effects and responses Acid rain
- Acid Survivors Foundation (Bangladesh) Acid Survivors Foundation
- Acid throwing (acid attack): overview, causes, consequences, and responses Acid throwing
- Ackee (Blighia sapida): tropical fruit, culinary uses and safety Ackee
- Acne: causes, types, treatment, and prevention Acne
- Acoelomorpha
- Aconcagua River — river of central Chile Aconcagua River
- Acorn: the nut-like fruit of oak trees — description, ecology and uses Acorn
- Acorn squash (Cucurbita pepo var. turbinata) Acorn squash
- Acoustic: Sound, Science, and Musical Contexts Acoustic
- Acoustic guitar: design, history, and musical uses Acoustic guitar
- Acre (Brazilian state) Acre (state)
- Acritarchs: organic-walled microfossils and the early eukaryote record Acritarch
- Acrobatics: physical discipline, performance and sport Acrobatics
- Acrocanthosaurus: the high‑spined theropod of the Lower Cretaceous Acrocanthosaurus
- Acromegaly — causes, symptoms, diagnosis, and treatment Acromegaly
- Acronym: definition, types, history and usage Acronym
- Across the Universe (2007 film) Across the Universe (movie)
- Act of Congress
- Actinopterygii — the ray-finned fishes Actinopterygii
- Action figure: poseable character figurines and their cultural role Action figure
- Action Jackson (1988 film) Action Jackson (1988 movie)
- Activation energy
- Active galactic nucleus (AGN) Active galactic nucleus
- Active transport: moving substances across membranes against gradients Active transport
- ActiveX: Microsoft’s Component Object Model–based Component Framework ActiveX
- Actor: profession, skills, media, and history Actor
- Acts of the Apostles
- Actuary
- Acupuncture: practice, history, uses, and safety Acupuncture
- Acute accent (´): uses, history, and typographic notes Acute accent
- Ad astra (Latin phrase) Ad astra (phrase)
- Ad Council (Advertising Council) Ad Council
- Ad hominem (argumentative fallacy and rhetorical tactic) Ad hominem
- Ada Hegerberg — Norwegian footballer and Ballon d'Or winner Ada Hegerberg
- Ada Yonath — Israeli crystallographer and Nobel laureate Ada Yonath
- Adam Clayton — Bassist of U2 Adam Clayton
- Adam Darski (Nergal) — Polish musician and Behemoth frontman Adam Darski
- Adam Gregg
- Adam Hicks — American actor, rapper and singer-songwriter Adam Hicks
- Adam Jones (American professional baseball outfielder) Adam Jones
- Adam Laxalt (American politician and former Nevada Attorney General) Adam Laxalt
- Adam Małysz: Polish ski jumping icon and rally driver Adam Małysz
- Adam Mickiewicz: Polish Romantic Poet, Thinker and National Figure Adam Mickiewicz
- Adam Ries (Adam Riese) — German arithmetician and author Adam Ries
- Adam Smith (1723–1790) — Scottish moral philosopher and economist Adam Smith
- Adam Stefan Sapieha — Polish cardinal and mentor of John Paul II Adam Stefan Sapieha
- Ádám Szalai
- Adam Weishaupt — Enlightenment philosopher and founder of the Bavarian Illuminati Adam Weishaupt
- Adam West: the 1960s Batman and a Career in Character Acting Adam West
- Adam Wylie: American actor, voice artist and stage performer Adam Wylie
- Adam's apple (laryngeal prominence) Adam's apple
- Adamantisaurus — a fragmentary titanosaur from the Late Cretaceous of Brazil Adamantisaurus
- Adamawa Region (Cameroon): geography, history, people and parks Adamawa Region
- Adams County, Wisconsin
- Adams Morgan — Washington, D.C. neighborhood overview Adams Morgan
- Adams–Onís Treaty (Transcontinental or Florida Purchase Treaty) Adams–Onís Treaty
- Adana — city in southern Turkey Adana
- Adana massacre (April 1909) Adana massacre
- Adapiformes: early fossil primates of the Eocene–Miocene world Adapiformes
- Adaptation (biology) Adaptation
- Adaptive immune system
- Adaptive radiation: rapid diversification of lineages Adaptive radiation
- Adaptive unconscious set of unconscious mental processes influencing judgment and decision making
- Adasaurus — a small dromaeosaur from the Late Cretaceous Gobi Desert Adasaurus
- Adder (Vipera berus): the common European viper Adder
- Addition reaction (organic chemistry) Addition reaction
- Additional Member System (AMS) Additional Member System
- Additions to Daniel (Susanna, Bel and the Dragon, Song of the Three) Additions to Daniel
- Address (contact identifier and location descriptor) Address
- Address bus (computer architecture) Address bus
- Adela Noriega: Mexican telenovela actress and cultural figure Adela Noriega
- Adèle Dumilâtre: French Romantic-era Ballerina (1821–1909) Adèle Dumilâtre
- Adélie Land (Terre Adélie) — French Antarctic claim Adélie Land
- Adelong, New South Wales: town, history and attractions Adelong, New South Wales
- Adenoid (pharyngeal tonsil): anatomy, function, and clinical significance Adenoid
- Adenosine triphosphate (ATP) — the cellular energy carrier Adenosine triphosphate
- Adephaga — a suborder of predatory beetles Adephaga
- Adetokunbo Ademola — Chief Justice of Nigeria (1958–1972) Adetokunbo Ademola
- Adi Parashakti: Mahadevi, the Supreme Goddess in Shaktism Adi Parashakti
- Adige — major river of northeastern Italy Adige
- Adipose tissue: types, structure, functions, and medical relevance Adipose tissue
- Aditi Sajwan — Indian television actress Aditi Sajwan
- Aditya I — Early Chola King Who Expanded Chola Power in Southern India Aditya I
- Adjara — Autonomous Republic on Georgia’s Black Sea Coast Adjara
- Adjective (grammar) Adjective
- Adjustable wrench (adjustable spanner) Adjustable wrench
- Adlai Stevenson II
- Adler Planetarium & Astronomy Museum
- Administrative division
- Administrative divisions of Azerbaijan 59 districts
- Administrative divisions of Croatia: counties, cities, municipalities, and settlements Administrative divisions of Croatia
- Administrative divisions of Iran
- Administrative divisions of Mexico: states, Mexico City and municipalities Administrative divisions of Mexico
- Subnational divisions of Pakistan: provinces, territories and administered Kashmir Administrative units of Pakistan
- Administrator of the Environmental Protection Agency
- Administrator of the Northern Territory
- Admiral: Senior Naval Rank — Meaning, History, and Usage Admiral
- Admission to the Union (U.S. Constitution) Admission to the Union
- Adobe (mudbrick): traditional earth construction, types, and uses Adobe
- Adolescence: the transition from childhood to adulthood Adolescence
- Adolf Anderssen — 19th-century German chess master and problemist Adolf Anderssen
- Adolf Hitler politician and the leader of the Nazi Party
- Adolf von Henselt: pianist, composer and 19th-century keyboard stylist Adolf von Henselt
- Adolfo Pérez Esquivel
- Adolfo Suárez — Architect of Spain's Transition to Democracy Adolfo Suárez
- Adolphe Adam (1803–1856): French composer of ballets, operas and songs Adolphe Adam
- Adolphe Nourrit: French tenor, librettist and influential figure in early Romantic opera Adolphe Nourrit
- Adolphe Sax
- Adour: river of southwestern France Adour
- Adrastea (Jupiter moon) Adrastea (moon)
- Adrenal gland: structure, hormones, and clinical significance Adrenal gland
- Adria Airways — Slovenia’s former national airline (1961–2019) Adria Airways
- Adriaen Coorte — Dutch painter of intimate still lifes Adriaen Coorte
- Adrian Edmondson: English comedian, actor and musician Adrian Edmondson
- Adrian Fenty
- Adrian Willaert: Flemish Master of the Venetian School Adrian Willaert
- Adriana Lecouvreur: Cilea's enduring lyric drama Adriana Lecouvreur
- Adrien Maurice de Noailles, 3rd Duke of Noailles — French soldier and statesman Adrien Maurice de Noailles, Duke of Noailles
- Adrienne Shelly: filmmaker, actress, and screenwriter Adrienne Shelly
- Adultery: definition, etymology, legal status, religious views and social impact Adultery
- Advance Australia Fair — origins, adoption, and cultural significance Advance Australia Fair
- Advance Auto Parts Clash
- Advanced Encryption Standard (AES) Advanced Encryption Standard
- Advanced Light Source — synchrotron facility at Lawrence Berkeley National Laboratory Advanced Light Source
- Advanced Photo System (APS): film format, features, history and decline Advanced Photo System
- Advent calendar: origins, types, traditions, and modern uses Advent calendar
- Adventure: definition, types, history and cultural significance Adventure
- Adventure fiction: definition, history, and key characteristics Adventure fiction
- Adventure film: genre, history, and defining features Adventure movie
- Adverb: definition, forms, uses, and examples Adverb
- Adverse effect (medicine): causes, classification and management Adverse effect (medicine)
- Advertising: purpose, channels, creative process, and social effects Advertising
- Advocacy: Public Support, Methods, Actors, and Impact Advocacy
- Adware — software that displays ads and may collect user information Adware
- Adyar River (Chennai, India) Adyar River
- Adyar, Chennai: neighbourhood, estuary and institutional centre Adyar, Chennai
- Áed mac Cináeda — King of the Picts (877–878) Áed, king of Scots
- Aegean cat
- Aegean Sea: Geography, history, and modern significance Aegean Sea
- Aegisthus (Greek mythological figure) Aegisthus
- Aegyptosaurus — African titanosaurian sauropod Aegyptosaurus
- Aeneas: Trojan prince, epic hero, and ancestor of Rome Aeneas
- Aeolian Islands (Lipari Islands) — volcanic archipelago north of Sicily Aeolian Islands
- Aero Caribbean Flight 883
- Aerobics: rhythmic fitness, formats, benefits, and historical development Aerobics
- Aérocentre — Aerospace cluster of Centre‑Val de Loire, France Aérocentre
- Aeronautical Literary Festival (Salon du livre aéronautique) Aeronautical literary festival
- AeronautX Luftfahrtschule — flight training school in Linz, Austria AeronautX Luftfahrtschule
- Aeronwy Thomas (1943–2009) Aeronwy Thomas
- Aerosmith: American rock band known for blues‑based hard rock and enduring hits Aerosmith
- Aérospatiale SA-330 Puma: French medium-lift transport helicopter Aérospatiale SA-330 Puma
- Aeschylus: Pioneer of Greek Tragedy and Author of the Oresteia Aeschylus
- Aesculus glabra (Ohio buckeye): description, range, and significance Aesculus glabra
- Aesop: Legendary Fabulist of Ancient Greece and the Tradition of Fables Aesop
- Aestivation: summer dormancy and survival strategies in animals Aestivation