Search by letter: A
Search by letter
Search by letter: A
- Across the Universe (song by the Beatles) Across the Universe
- Across the Universe (2007 film) Across the Universe (movie)
- Acrostic: form, history, and uses Acrostic
- Acryl: the acryloyl group, acrylic compounds, and their polymers Acryl
- Acrylic paint: properties, history, techniques, and uses Acrylic paint
- Act
- Act (drama)
- ACT (college admissions test) ACT (test)
- Act Against Bullying — UK charity supporting children and young people Act Against Bullying
- Act of Congress
- Act of Parliament
- Actias luna (Luna moth) Actias luna
- Acting President of the United States
- Actinide (series of chemical elements) Actinide
- Actinidia — genus of woody vines including kiwifruit Actinidia
- Actinium (Ac), chemical element 89 Actinium
- Actinobacteria (Actinomycetota) Actinobacteria
- Actinolite — a green amphibole mineral of metamorphic rocks Actinolite
- Actinopterygii — the ray-finned fishes Actinopterygii
- Action-adventure game Action adventure game
- Action Comics
- Action figure: poseable character figurines and their cultural role Action figure
- Action game
- Action Jackson (1988 film) Action Jackson (1988 movie)
- Action role-playing game (Action RPG) Action role-playing game
- Action theory (philosophy) Action theory
- ActionScript: Overview, History, Features, and Uses ActionScript
- Actis, California
- Activation energy
- Active fault
- Active galactic nucleus (AGN) Active galactic nucleus
- Active transport: moving substances across membranes against gradients Active transport
- Active Worlds — an early, user-created 3D virtual world platform Active Worlds
- ActiveX: Microsoft’s Component Object Model–based Component Framework ActiveX
- Activision — American video game publisher and developer Activision
- Activism: purposes, methods, history, and cultural forms Activism
- Acton
- Acton Town tube station
- Acton, London — West London district in the Borough of Ealing Acton, London
- Acton, Massachusetts
- Acton, Suffolk
- Actor: profession, skills, media, and history Actor
- The Actors Studio Actors Studio
- Acts of Supremacy: Royal Authority over the Church of England Acts of Supremacy
- Acts of the Apostles
- Acts of Union 1707
- Acts of Union 1800
- Actuary
- Actuator: devices that convert energy into controlled motion Actuator
- Acuminite: a colorless, sharply pointed mineral from Ivigtut Acuminite
- Acupuncture: practice, history, uses, and safety Acupuncture
- Acura — Honda’s luxury and performance automobile marque Acura
- Acute
- Acute (medicine)
- Acute accent (´): uses, history, and typographic notes Acute accent
- Acute angle
- Acute myeloid leukemia: overview, diagnosis, treatment, and key facts Acute myeloid leukemia
- Acute radiation syndrome (radiation sickness) Acute radiation syndrome
- Acy (commune in Aisne, Picardie, France) Acy
- Acy-Romance: Commune in Ardennes, Grand Est, France Acy-Romance
- Agrupación Deportiva Almería (AD Almería) AD Almería
- Ad astra (Latin phrase) Ad astra (phrase)
- Ad Council (Advertising Council) Ad Council
- Ad hominem (argumentative fallacy and rhetorical tactic) Ad hominem
- Ada (programming language)
- Ada County, Idaho
- Ada Hegerberg — Norwegian footballer and Ballon d'Or winner Ada Hegerberg
- Ada Jafri (Ada Jafarey): Pakistani Urdu Poet (1924–2015) Ada Jafri
- Ada Lovelace (Augusta Ada King, Countess of Lovelace) Ada Lovelace
- Ada Odd Fellows Temple (Boise, Idaho) Ada Odd Fellows Temple
- Ada Township, Michigan — Overview, history, and community profile Ada Township, Michigan
- Ada Yonath — Israeli crystallographer and Nobel laureate Ada Yonath
- Ada, Minnesota
- Ada Township, Dickey County, North Dakota Ada, North Dakota
- Ada, Ohio
- Ada, Oklahoma
- Adachi, Tokyo (Adachi-ku) Adachi, Tokyo
- Adagio (music): the slow tempo and its musical role Adagio (music)
- Adagio for Strings
- Adair County, Iowa: overview, geography, history, and communities Adair County, Iowa
- Adair County, Kentucky
- Adair County, Missouri
- Adair County, Oklahoma
- Adair, Iowa
- Adair, Oklahoma — small town in northeastern Oklahoma Adair, Oklahoma
- Adairville, Kentucky — Small City in Logan County Adairville, Kentucky
- Adak, Alaska: Remote Aleutian Community and Former Military Base Adak, Alaska
- Adalberto Giazotto
- Adalet Ağaoğlu — Turkish novelist and playwright Adalet Ağaoğlu
- Adam Air Flight 574: 2007 Indonesia Boeing 737-400 Crash Adam Air Flight 574
- Adam Alsing — Swedish television and radio presenter Adam Alsing
- Adam and Eve — Origins, Narrative, and Cultural Influence Adam and Eve
- Adam and Steve: origin, use, and cultural responses to a slogan Adam and Steve
- Adam Baldwin (actor) Adam Baldwin
- Adam Bandt: Australian Greens leader and federal MP Adam Bandt
- Adam Birch (Joey Mercury) — American professional wrestler and trainer Adam Birch
- Adam Brody
- Adam Burish
- Adam Carolla
- Adam Clayton — Bassist of U2 Adam Clayton
- Adam Clayton (English footballer) Adam Clayton (footballer)
- Adam Clymer — American political journalist (1937–2018) Adam Clymer
- Adam Darius: dancer, mime artist, writer and choreographer Adam Darius
- Adam Darski (Nergal) — Polish musician and Behemoth frontman Adam Darski
- Adam Deadmarsh
- Adam DeVine: Actor, Comedian, Writer and Producer Adam DeVine
- Adam Driver — American actor, stage performer, and film lead Adam Driver
- Adam Dunn
- Adam Elliot: Australian stop-motion animator Adam Elliot
- Adam Faith (Terence Nelhams-Wright): British singer, actor and journalist Adam Faith
- Adam Foote (Canadian ice hockey defenceman) Adam Foote
- Adam Gilchrist — Australian wicketkeeper-batsman Adam Gilchrist
- Adam Goodes: Australian rules footballer, community leader and advocate Adam Goodes
- Adam Gregg
- Adam Hicks — American actor, rapper and singer-songwriter Adam Hicks
- Adam Jones (American professional baseball outfielder) Adam Jones
- Adam Kinzinger: Illinois Representative, Air National Guard Officer, and Republican Dissenter Adam Kinzinger
- Adam Kokesh
- Adam Kokesh's 2020 presidential campaign Adam Kokesh 2020 presidential campaign
- Adam Lambert: singer, performer, and longtime collaborator with Queen Adam Lambert
- Adam Laxalt (American politician and former Nevada Attorney General) Adam Laxalt
- Adam Levine
- Adam Maher (rugby league)
- Adam Małysz: Polish ski jumping icon and rally driver Adam Małysz
- Adam McKay
- Adam McQuaid
- Adam Mickiewicz: Polish Romantic Poet, Thinker and National Figure Adam Mickiewicz
- Adam Parfrey: publisher, editor, and chronicler of fringe culture Adam Parfrey
- Adam Price — Welsh politician and Plaid Cymru leader Adam Price
- Adam Purple (David Lloyd Wilkie) — Urban Gardener and Environmental Activist Adam Purple
- Adam Ries (Adam Riese) — German arithmetician and author Adam Ries
- Adam Rose (Raymond Leppan) — South African professional wrestler Adam Rose
- Adam Sandler: comedian, actor, producer and notable film roles Adam Sandler
- Adam Savage (television presenter and special-effects artist) Adam Savage
- Adam Schiff — U.S. Representative and congressional intelligence figure Adam Schiff
- Adam Schlesinger — songwriter, producer and founding member of Fountains of Wayne Adam Schlesinger
- Adam Scott (American actor and comedian) Adam Scott
- 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
- Adam Svoboda — Czech ice hockey goaltender and coach Adam Svoboda
- 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 Wójcik — Polish basketball player and PLK all-time leading scorer Adam Wójcik
- Adam Wylie: American actor, voice artist and stage performer Adam Wylie
- Adam Yahiye Gadahn: American convert and al‑Qaeda spokesman Adam Yahiye Gadahn
- Adam Yauch (MCA) — musician, filmmaker, and activist Adam Yauch
- Adam's apple (laryngeal prominence) Adam's apple
- Adama Barrow — President of the Gambia Adama Barrow
- Adamantisaurus — a fragmentary titanosaur from the Late Cretaceous of Brazil Adamantisaurus
- Adamawa Region (Cameroon): geography, history, people and parks Adamawa Region
- Adaminaby — high-country town in New South Wales Adaminaby
- Adamite — zinc arsenate mineral Adamite
- Adams (town), Wisconsin
- Adams County, Colorado
- Adams County, Idaho
- Adams County, Illinois — overview, geography, history and local life Adams County, Illinois
- Adams County, Indiana
- Adams County, Iowa
- Adams County, Mississippi
- Adams County, Nebraska
- Adams County, North Dakota
- Adams County, Ohio
- Adams County, Pennsylvania
- Adams County, Washington
- Adams County, Wisconsin
- Adams Morgan — Washington, D.C. neighborhood overview Adams Morgan
- Adams National Historical Park
- Adams Park — stadium in High Wycombe, Buckinghamshire Adams Park
- Adams–Onís Treaty (Transcontinental or Florida Purchase Treaty) Adams–Onís Treaty
- Adams (town), Adams County, Wisconsin Adams, Adams County, Wisconsin
- Adams (town), Green County, Wisconsin Adams, Green County, Wisconsin
- Adams, Jackson County, Wisconsin (town) Adams, Jackson County, Wisconsin
- Adams, Wisconsin
- Adams' Grammar School (Newport, Shropshire) Adams' Grammar School
- Adamson University
- Adamsville, Alabama
- Adamu Ciroma: Nigerian Politician, Central Banker and Finance Minister Adamu Ciroma
- Adana — city in southern Turkey Adana
- Adana massacre (April 1909) Adana massacre
- Adâncata (Suceava County, Romania) Adâncata, Suceava
- Adansonia gregorii (boab): the Australian baobab Adansonia gregorii
- Adão Nunes Dornelles (1923–1991) Adão Nunes Dornelles
- Adapiformes: early fossil primates of the Eocene–Miocene world Adapiformes
- Adaptation (biology) Adaptation
- Adaptive immune system
- Adaptive optics: correcting optical distortion in real time Adaptive optics
- Adaptive radiation: rapid diversification of lineages Adaptive radiation
- Adaptive unconscious set of unconscious mental processes influencing judgment and decision making
- Adarsh Sein Anand — Indian jurist and 29th Chief Justice of India Adarsh Sein Anand
- Adasaurus — a small dromaeosaur from the Late Cretaceous Gobi Desert Adasaurus
- ADD — meanings: Attention Deficit Disorder, add (verb), addition, and abbreviations ADD
- Addenbrooke's Hospital — Cambridge teaching hospital and research centre Addenbrooke's Hospital
- Adder (Vipera berus): the common European viper Adder
- Adderall (amphetamine mixed salts): uses, formulation, effects, and risks Adderall
- Addicted to Love (1997 film) Addicted to Love (movie)
- Addiction: causes, brain mechanisms, treatment, and prevention Addiction
- Addictive personality: traits, causes, controversies and treatment Addictive personality
- Addieville, Illinois
- Addington, Croydon (South London) Addington
- Addington, Oklahoma
- Addis Ababa (Addis Abeba, Finfinne) Addis Ababa
- Addis Ababa–Djibouti Railway
- Addis, Louisiana
- Addiscombe: district overview, history, and modern character Addiscombe
- Addison County, Vermont
- Addison, Alabama
- Addison, Illinois
- Addison, New York — Town profile and overview Addison, New York
- Addison, Texas
- Addison, Wisconsin (town) Addison, Wisconsin
- Addison's disease: primary adrenal insufficiency and management Addison's disease
- Addition (mathematics) Addition
- 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
- Additive (chemistry and practical uses) Additive
- Addlestone, Surrey: Overview and Notable Features Addlestone
- Address (contact identifier and location descriptor) Address
- Address bus (computer architecture) Address bus
- Address Resolution Protocol (ARP) Address Resolution Protocol
- Adduction (movement toward the body's midline) Adduction
- Adebayo Adedeji: Nigerian Economist and Architect of African Development Policy Adebayo Adedeji
- Adel, Georgia
- Adel, Iowa: County Seat and Community in the Des Moines Area Adel, Iowa
- Adela Florence Nicolson (Laurence Hope): English poet in India Adela Florence Nicolson
- Adela Noriega: Mexican telenovela actress and cultural figure Adela Noriega
- Adela of Normandy (c. 1067–1137) Adela of Normandy
- Adelaide — capital city of South Australia Adelaide
- Adelaide Chiozzo — Brazilian actress and accordionist Adelaide Chiozzo
- Adelaide Football Club (Crows) — AFL team from South Australia Adelaide Football Club
- Adelaide of Aquitaine
- Adelaide of Saxe‑Meiningen Adelaide of Saxe-Meiningen
- Adelaide River (Northern Territory, Australia) Adelaide River
- Adelaide United FC
- Adelaide Zoo
- Adelante (Sash! song)
- Adelanto, California
- Adelboden — Swiss Alpine village and resort Adelboden
- Adele (English singer and songwriter) Adele
- Adele Addison — American soprano and concert soloist noted for Baroque repertoire Adele Addison
- Adèle Dumilâtre: French Romantic-era Ballerina (1821–1909) Adèle Dumilâtre
- Adélie Land (Terre Adélie) — French Antarctic claim Adélie Land
- Adélie penguin (Pygoscelis adeliae) Adélie penguin
- Adelina Patti (1843–1919) Adelina Patti
- Adeline, Illinois — small village in Ogle County Adeline, Illinois
- Adell, Wisconsin
- Adelobasileus — an early mammaliaform from the Late Triassic Adelobasileus
- Adelong, New South Wales: town, history and attractions Adelong, New South Wales
- Adelsheim — historic town in Neckar-Odenwald, Baden-Württemberg Adelsheim
- Adem Demaçi: Kosovo Albanian writer, dissident and human-rights leader Adem Demaçi
- Ademir da Guia
- Ademir Marques de Menezes
- Aden (Yemen) — port city and strategic harbor Aden
- Aden Abdullah Osman Daar
- Adenan Satem: Sarawak Chief Minister and Statesman Adenan Satem
- Adenine: structure, functions, and biological significance Adenine
- Adenoid (pharyngeal tonsil): anatomy, function, and clinical significance Adenoid
- Adenoidectomy: surgical removal of the adenoids Adenoidectomy
- Adenomus — a small genus of Sri Lankan true toads Adenomus
- Adenorhinos — a monotypic viper genus (Adenorhinos barbouri) Adenorhinos
- Adenosine diphosphate (ADP) Adenosine diphosphate
- 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
- Adewale Akinnuoye-Agbaje
- Adgestone — hamlet on the Isle of Wight near Brading Adgestone
- Adhan — the Islamic call to prayer Adhan
- Adhemar Pimenta — Brazilian football manager and early national coach Adhemar Pimenta
- Adhemir de Barros
- Adhesion: how different materials stick together and why it matters Adhesion
- Adhesive: types, properties, history, and applications Adhesive
- Adhesive tape: types, composition, uses, and history Adhesive tape
- Adi Parashakti: Mahadevi, the Supreme Goddess in Shaktism Adi Parashakti
- Adi Shankara: Founder of Advaita Vedanta and Classical Indian Philosopher Adi Shankara
- Adiabatic process
- Adib Boroumand: Iranian Poet, Lawyer and National Front Leader Adib Boroumand
- Adib Jatene — Brazilian cardiothoracic surgeon and creator of the arterial switch operation Adib Jatene
- Adidas
- Adiel de Oliveira Amorim — Brazilian professional footballer Adiel de Oliveira Amorim
- Adige — major river of northeastern Italy Adige
- Adil Abdul-Mahdi — Iraqi politician and economist Adil Abdul-Mahdi
- Adin Steinsaltz (1937–2020): Scholar, Talmudist, and Educator Adin Steinsaltz
- Adina Howard: 1990s R&B singer best known for "Freak Like Me" Adina Howard
- Adinath Temple (Maheshkhali) — hilltop Shiva shrine and annual fair Adinath Temple, Maheshkhali
- Adinfer (commune in Pas-de-Calais, northern France) Adinfer
- Adipocyte: structure, types, functions and clinical significance Adipocyte
- Adipose tissue: types, structure, functions, and medical relevance Adipose tissue
- Adirondack Mountains
- Adirondack Phantoms
- Adisumarmo International Airport — Solo Raya's principal airport Adisumarmo International Airport
- Aditi Sajwan — Indian television actress Aditi Sajwan
- Aditya I — Early Chola King Who Expanded Chola Power in Southern India Aditya I
- Adıyaman: city and provincial capital in southeastern Turkey Adıyaman
- Adjacent: meaning and uses in geometry, trigonometry, and everyday contexts Adjacent
- Adjara — Autonomous Republic on Georgia’s Black Sea Coast Adjara
- Adjective (grammar) Adjective
- Adjudicator: Role, Types, and Functions in Competitions and Law Adjudicator
- Adjustable wrench (adjustable spanner) Adjustable wrench
- Adjustment: definition, types, and everyday uses Adjustment