This list contains acronyms, initialisms, and pseudo-blends that begin with the letter A.
For the purposes of this list:
- acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
- initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
- pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
- (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
- (i) = initialism, e.g.: CD – (i) compact disc
- (p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
- (s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)
Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.
A0–9
- A1C – Airman First Class
- A2ATD or A2ATD – (i) Anti-Armour Advanced Technology Demonstration
- A2C2 or A2C2 – (i) Army Airspace Command and Control
- A3 – many, including a European larger than standard office paper size
- A4 – many, including a European standard office paper size; see entry
- A10 – (i) Atlantic 10 Conferencee
AA
- aa – (s) Afar language (ISO 639-1 code)
- aA – (s) Attoampere
- AA
- (i) achieved availability
- Alcoholics Anonymous
- (s) Armed Forces Americas (postal symbol)
- Aruba (FIPS 10-4 territory code)
- (i) assembly area
- Automobile Association
- avenue of approach
- American Airlines
- Aerolíneas Argentinas
- AAA
- (i) administration, authorization, and authentication
- American Automobile Association ("Triple-A")
- anti-aircraft artillery
- Amateur Athletic Association (of England)
- Asistencia Asesoría y Administración (Spanish, "Assistance, Consulting, and Administration" — original name of Mexican professional wrestling promotion Lucha Libre AAA Worldwide)
- AAAI – (i) Association for the Advancement of Artificial Intelligence, formerly American Association for Artificial Intelligence
- AAAS – (i) American Association for the Advancement of Science
- AAAV – (i) Advanced Amphibious Assault Vehicle
- AABN – (i) African Aurora Business Network
- AABP – (i) American Association of Bovine Practitioners
- AAC
- AACL – (i) Albanian American Civic League
- AACCS – (i) American Association of Christian Colleges and Seminaries
- AAD
- (i) analogue-analogue-digital (CD quality)
- Australian Antarctic Division
- AADHD – Adult attention deficit hyperactivity disorder
- AADT – (i) annual average daily traffic
- AADAC – (a) Alberta Alcohol and Drug Abuse Commission
- AADC
- (i) area air defense commander
- (i) amino acid decarboxylase
- (i) aromatic L-amino acid decarboxylase
- (i) Australian Antarctic Data Centre
- AAFC
- (i) U.S. Army Air Corps Ferrying Command (1941–1942)
- All-America Football Conference (1946–1949)
- AAFES – (i) Army and Air Force Exchange Service
- AAI – (i) applied artificial intelligence
- AAIS – (i) advanced airborne interceptor simulator
- AAM – (i) air-to-air missile
- AAMOF – (i) as a matter of fact
- AAN – (i) American Academy of Nursing
- AANEAS – (a) Anglo-Australian Near-Earth Asteroid Survey
- AAODL – (i) Atmospheric Aerosols and Optics Data Library
- a.a.p. – (i) Associated Artists Productions (former film distributor)
- AAP
- (i) advanced acquisition plan
- Allied administrative publication
- American Academy of Pediatrics
- AAPC – (i) Accounting and Auditing Policy Committee
- aar – (s) Afar language (ISO 639-2 code)
- AAR
- AARP – (i/s) American Association of Retired Persons (now officially known only by the initials)
- AAS
- (i) Advanced Automation System
- American Astronomical Society ("double-A-S")
- AASPEM – (i) advanced air-to-air system performance evaluation model
- AAT – (i) Australian Antarctic Territory
- AAV – (i) Amphibious Assault Vehicle
- AAWC – (i) anti-air warfare commander
AB
- ab – (s) Abkhaz language (ISO 639-1 code)
- AB
- (i) Able Seaman (both the rank and the occupation)
- (s) Alberta (postal symbol)
- ABA
- ABB – (i) ASEA Brown Boveri (Swiss-Swedish multinational company)
- ABBA – (a) Agnetha, Benny, Björn, Anni-Frid (Swedish pop group)
- ABC
- (i) abstinence, be faithful, condoms
- Active Body Control
- airway, breathing, circulation (see CPR)
- Alcoholic Beverage Commission
- alien big cat
- always be careful
- American Bird Conservancy
- American-born Chinese
- American Broadcasting Company
- anti-lock brake controller
- Associated British Cinemas
- ABC Cinemas
- ABC Weekend TV (Associated British Cinemas (Television) Ltd / ABC Television Ltd)
- Associated British Corporation (ABC Television Films Ltd)
- Atanasoff–Berry Computer
- Atlantic Baptist College
- atomic, biological, chemical (see NBC)
- Australian Broadcasting Corporation
- already been chewed gum
- ABCA
- (i) American, British and Canadian Armies (originally)
- Army Bureau of Current Affairs
- ABCS – (i) (U.S.) Army Battle Command System
- ABET – (a) Accreditation Board for Engineering and Technology
- ABFIST – (i) Advanced Bradley Full Crew Interactive Skills Trainer
- ABGI – (i) Addington-Barker Group International
- ABIN – (a) Agência Brasileira de Inteligência (Brazilian Intelligence Agency)
- abk – (s) Abkhaz language (ISO 639-2 code)
- ABL – (i) American Basketball League
- ABLE
- (a) Achieving a Better Life Experience Act, a U.S. law that established tax-advantaged accounts for the benefit of individuals with disabilities
- AirBorne Law Enforcement (police air support unit)
- ABM – (i) anti-ballistic missile – Asynchronous Balanced Mode – automated banking machine
- ABMC – (i) American Battle Monuments Commission
- ABN
- (i) Australian Business Number (a number issued by the Australian government as registration of a business and used for taxation purposes)
- Advance Beneficiary Notice of Non-coverage (a form used in health insurance)
- ABPI – (i) Association of the British Pharmaceutical Industry
- ABRSM – (a) Associated Board of the Royal Schools of Music
- ABS
- ABSA – (a) Amalgamated Banks of South Africa ("ab-sa")
- ABSTRIPS – (p) abstraction-based STRIPS
- ABV – (i) Alcohol by volume
- ABW – (s) Aruba (ISO 3166 trigram)
AC
- aC – (s) Attocoulomb
- Ac – (s) Actinium
- AC
- (i) Adriamycin-Cyclophosphamide (chemotherapy)
- Air Conditioning
- Aircraftman
- Alternating Current
- Altocumulus
- ante Christum (Latin, "before Christ"; see BC)
- ante cibum (Latin, "before meals")
- (s) Antigua and Barbuda (FIPS 10-4 country code)
- (i) Associazione Calcio (Italian, "football (soccer) club")
- A/C – (i) Air Conditioned/Conditioning – Aircraft
- AC1 – Aircraftman 1st Class
- AC2 – Aircraftman 2nd Class
- ACA
- Affordable Care Act, shorthand for the Patient Protection and Affordable Care Act, commonly called "Obamacare"
- (i) Airspace Control Authority
- Airspace Co-ordination Area
- A Current Affair
- ACAB, short for "All Cops Are Bastards"; used as a political slogan associated with dissidents who are opposed to the police.
- ACARS – (a) Aircraft Communications Addressing and Reporting System
- ACAS
- ACB – (i) Asociación de Clubes de Baloncesto (Spanish for "Association of Basketball Clubs")
- ACC
- ACCA
- (i) The Association of Chartered Certified Accountants
- Automatic Cloud Cover Assessment
- ACCAC – (a) Awdurdod Cymwysterau, Cwricwlwm ac Asesu Cymru (Qualifications, Curriculum and Assessment Authority for Wales)
- ACCD – American Coalition of Citizens with Disabilities
- ACCS – (i) Air Communications and Control Squadron
- ACDA – (i) Arms Control & Disarmament Agency
- ACDC
- (i) Alternating Current Direct Current
- the name of an Australian rock music band
- a term for a bisexual person
- A/Cdre – Air Commodore
- ACDT
- ACE
- ACE2 – (i/p) Angiotensin-converting enzyme 2 (pronounced "ace-two")
- ACES
- (a) Aerolíneas Centrales de Colombia (Spanish, "Central Colombian Airlines")
- Auxiliary Campus Enterprises and Services of Alfred State College
- ACF
- ACH – (i) Automated clearing house
- ACHT – (i) Average Call Hold Time
- ACID – (a) Atomicity, Consistency, Isolation, and Durability (in databases)
- ACINT – (p) Acoustic Intelligence
- ACK – (p) Acknowledge (telecommunications; cf. NAK)
- ACL
- (i) Access Control List
- Anterior cruciate ligament; the initialism can also refer to an injury to this ligament
- Atlantic Coast Line Railroad
- ACLJ – (i) American Center for Law and Justice
- ACLOS – (i) Automatic CLOS (missile control system)
- ACLS – (i) American Council of Learned Societies
- ACLU
- (i) American Civil Liberties Union
- American Communist Lawyers Union (pejorative slang for the above)
- ACM – many, including Association for Computing Machinery; see entry
- ACMC – (i) (U.S.) Assistant Commandant of the Marine Corps
- ACN
- (i) Airborne Communications Node
- Australian Company Number (number issued by the Australian government as registration of a limited liability company)
- ACNA – (i) Anglican Church in North America
- ACO – (i) Airspace Control Order
- ACOBA – (a) Advisory Committee on Business Appointments
- ACOG – (a) American College of Obstetricians and Gynecologists
- ACOM – (p) (U.S.) Atlantic Command
- ACORN – (a) Association of Community Organizations for Reform Now
- ACP
- (i) African, Caribbean and Pacific Group of States
- Air Control Point
- ACR – (i) Advanced Concepts and Requirements
- ACRI – (p) African Crisis Response Initiative
- ACRT – (i) Advanced Concepts Research Tool simulator
- ACS
- (i) Affiliated Computer Services (NYSE ACS)
- Alaska Communications Service
- American Cancer Society
- American Chemical Society
- Association of Caribbean States
- Australian Computer Society
- ACSC – (i) Army Command and Staff College (various nations)
- ACST – (i) Australian Central Standard Time
- ACST – (i) American Cooperative School of Tunis
- ACT
- (i) Adaptive Control of Thought (cognitive model)
- American College Test (ing Program)
- Australian Capital Territory (also postal symbol)
- ACT UP – (a) AIDS Coalition to Unleash Power
- ACTD – (i) Advanced Concept Technology Demonstration
- ACTF
- (i) (U.S.) Army Constructive Training Federation
- Australian Children's Television Foundation
- ACT-R – (i) ACT-Rational (cognitive model)
- ACT-R/PM – (i) ACT-R/Perceptual-Motor (cognitive model)
- ACTU – (i) Australian Council of Trade Unions
- ACU
- ACUF
- ACV – (i) Armoured Combat Vehicle
AD
- AD – (i) Air Defence – (s) Andorra (ISO 3166 digram) – (i) Anno Domini (Latin, "In the year of our Lord")
- A/D – (i) Analog/Digital
- ADA
- (i) Air Defence Artillery
- American Dental Association
- Assistant District Attorney
- Americans with Disabilities Act (see also the similar but non-acronymic Ada programming language)
- ADA Cryptocurrency token for Cardano blockchain
- ADAC – (a/i) Allgemeiner Deutscher Automobil-Club (German, "General German Automobile Club")
- ADAGE – (a) Air Defense Air to Ground Engagement (simulation)
- ADAP – (i) AIDS Drug Assistance Program
- ADAS – (a/i) Asiago-DLR Asteroid Survey
- ADAT – (i) Alesis Digital Audio Tape (recording format)
- ADatP – (p) Automated Data Processing
- ADATS –
- (i) Agricultural Development and Training Society
- Air Defence Anti-Tank System
- Australian Defence Air Traffic System
- ADB – (i) Asian Development Bank
- ADB- All da best/All the best - texting slang
- ADC –
- (i) Aide De Camp
- U.S. Air Defense Command (1946–1992)
- Apple Display Connector
- ADCTS – (i) Advanced Distributed Combat Training System
- ADD –
- (i) Analog Digital Digital (CD quality)
- Attention-Deficit Disorder
- Administration on Developmental Disabilities
- ADDIE – (i) Analyze Design Develop Implement and Evaluate
- ADDNS – (i) Advanced Deployable Day/Night Simulation
- ADE
- ADF
- ADGB – Air Defence of Great Britain
- ADHD – (i) Attention-Deficit Hyperactivity Disorder
- ADHS – (i) Attention-Deficit Hyperactivity Syndrome
- ADI – (i) Acceptable/Allowable Daily Intake
- ADIZ – (a/i) Air Defence Identification Zone
- ADL – (i) Anti-Defamation League
- ad loc. – (p) ad locum (Latin, "to/at the place")
- ADM –
- (i) Administrative
- (s) Admiral, and the U.S. Public Health Service Commissioned Corps
- Archer Daniels Midland
- Assistant Deputy Minister
- ADOA – (a/i) Air Defence Operations Area
- ADP –
- (i) Adenosine DiPhosphate
- Army Doctrine Publication (UK, Canada, Australia)
- Automatic/Automated Data Processing
- ADRG – (p) Arc-second Raster Chart (ARC) Digitized Raster Graphics
- ADS –
- ADSR – (i) Attack, Decay, Sustain, Release (sound envelope specification)
- ADT
- (i) Abu Dhabi Terminals, operator of commercial ports in Abu Dhabi
- American District Telegraph, a former name of ADT Inc.
- Atlantic Daylight Time (UTC−3 hours)
- ADTB – (i) Army Doctrine and Training Bulletin
- adv. – (p) adversus (Latin, "against")
- ADW – (i) Air Defence Warning
AE
- ae – (s) Avestan language (ISO 639-1 code)
- AE
- (s) Armed Forces Africa/Canada/Europe/Middle East (postal symbol)
- United Arab Emirates (ISO 3166 digram; FIPS 10-4 country code)
- (i) Artix Entertainment
- American Eagle
- A&E
- (a/i) Arts & Entertainment Network, the original name for the U.S. TV channel now known as A&E Network
- Accident and Emergency
- AEB – Autonomous Emergency Braking, see Collision avoidance system
- AED – (s) United Arab Emirates dirham (ISO 4217 currency code)
- AEDT – (a) Australian Eastern Daylight Time
- AEF – (i) American Expeditionary Force
- AEGIS – (p) Airborne Early warning Ground environment Interface Segment (fake etymology)
- AEI-T – (i) Army Enterprise Infostructure-Transport
- aeq. – (p) aequalis (Latin, "equal")
- AESR – (i) Aeronautical Equipment Service Record
- AEST – (a) Australian Eastern Standard Time
- aet. – (p) aetatis (Latin, "of age", "aged")
- aet – (i) After extra time (Football)
- AEW
- (i) Air Expeditionary Wing
- (i) Airborne early warning
- (i) Airborne electronic warfare
- (i) All Elite Wrestling (US professional wrestling promotion)
AF
- af – (s) Afrikaans language (ISO 639-1 code)
- aF – (s) Attofarad
- AF
- (s) Afghanistan (FIPS 10-4 country code; ISO 3166 digram)
- (i) Air Force
- As fuck
- AFA
- (i) U.S. Air Force Academy
- Asociación del Fútbol Argentino (Spanish, "Argentine Football Association")
- AFAIC – (i) As Far As I'm Concerned
- AFAICT – (i) As Far As I Can Tell
- AFAIK – (i) As Far As I Know
- AFAIR – (i) As Far As I Remember/Recall
- AFAM
- (i/a) Associazione Friulana di Astronomia e Meteorologia (Italian, "Friuli Association of Astronomy and Meteorology")
- (p) Department of African and Afro-American Studies, University of North Carolina at Chapel Hill — notable for its links to the school's academic-athletic scandal in the 2010s
- AFATDS – (i) Advanced Field Artillery Tactical Data System
- AFC
- (i) American Football Conference
- Approved for construction
- Asian Football Confederation
- AFCEA – (i) Armed Forces Communications and Electronics Association
- AfD
- (i) Allianz für Deutschland ("Alliance for Germany"), former political alliance in East Germany
- Alternative für Deutschland ("Alternative for Germany"), current German political party
- AFD
- (i) Active Format Description, a technical standard for TV or set-top box decoders
- Advanced Format Drive, a type of computing storage device
- Adjustable-frequency drive
- Adult Film Database, web-based database of adult cinema
- Agence française de développement ("French Development Agency"), a French international development agency
- Alliance des forces démocratiques (French; "Alliance of Democratic Forces"), an Ivorian political alliance
- Alliance for Freedom and Democracy, an Eritrean political party
- AFDB – (i) African Development Bank
- AFES – (i) Automatic Fire Extinguishing System
- AFG – (s) Afghanistan (ISO 3166 trigram)
- AFGAM – (i) Amazon Facebook Google Apple Microsoft
- AFI
- (s) French Territory of the Afars and Issas (ISO 3166 trigram; obsolete since 1977)
- (i) "Agencia Federal de Investigaciónes" (México)
- AFIS
- AFIST – (i) Abrams Full Crew Interactive Skills Trainer
- AFJ – (i) April Fool's Joke
- AFK – (i) Away From Keyboard (Internet chat abbreviation)
- AFL
- (i) American Federation of Labor
- American Football League — either the 1960s league that merged into the National Football League, or one of several other leagues of American football
- Arena Football League
- Australian Football League
- AFL–CIO – (i) American Federation of Labor – Congress of Industrial Organizations
- AFLAC – (a) American Family Life Assurance Company of Columbus
- AFM – (i) Army Field Manual (UK; the U.S. more frequently uses just FM) – Atomic Force Microscope – Aviation Fleet Maintenance
- AFN – (s) Afghani (ISO 4217 currency code)
- AFO – (i) Association of Field Ornithologists
- AFOSR – (i) U.S. Air Force Office of Scientific Research
- AFP
- (i) Agence France-Presse (French, "French Press Agency")
- Australian Federal Police
- AFQT – (i) Armed Forces Qualification Test
- afr – (s) Afrikaans language (ISO 639-2 code)
- AFRC – (i) Air Force Reserve Command
- AFRL – (i) Air Force Research Laboratory
- AFROTC – (i) Air Force Reserve Officer Training Corps
- AFRRI – (i, U.S.) Armed Forces Radiobiology Research Institute
- AFRTS – (i) Armed Forces Radio and Television Service
- AFS
- (i) Active Front Steering
- Air Facility Sub-System
- Amniotic Fluid-derived Stem cell
- AFS&A or AFSA – (i) U.S. Air Force Studies and Analysis
- AFSC
- (i) U.S. Air Force Staff College (obsolete; replaced by JFSC)
- U.S. Air Force Systems Command
- AFSCN – (i) U.S. Air Force Satellite Control Network
- AFSPC – (i) Air Force Space Command
- AFT – American Farmland Trust
- AFV – (i) armoured fighting vehicle or America's Funniest Home Videos
- AFWA
- (a) Air Force Weather Agency
- Association of Fish and Wildlife Agencies
AG
- ag – (s) Attogram
- Ag – (s) Silver (Latin argentum)
- AG
- (i) air gunner
- Aktiengesellschaft (German, "incorporated")
- (s) Algeria (FIPS 10-4 country code)
- Antigua and Barbuda (ISO 3166 digram)
- Assemblies of God
- AGA
- (a/i) AB Gas-accumulator ("ah-gah", Swedish company)
- Advanced Graphics Architecture
- AGARD – (a) Advisory Group for Aerospace Research and Development
- AGARDograph – (p) Advanced Guidance for Alliance Research and Development publication
- AGASA – (a) Akeno Giant Air Shower Array (cosmic ray detector)
- AGB – (i) Internal Nintendo initialism (Advanced Game Boy) for Game Boy Advance
- AGC
- AGC – (i) Adjutant General's Corps (British Army)
- AGDC – (i) Australian Game Developers' Conference
- AGI – (i) Auxiliary Group Intelligence
- AGL – (i) Above Ground Level
- AGM – (i) Annual General Meeting
- AGN – (i) Active Galactic Nucleus
- AGO – (s) Angola (ISO 3166 trigram)
- AGP – (i) Accelerated Graphics Port
- AGRICOLA – (a) Agriculture Online Access
- AGS – (i) Alaska Ground Station (LandSat)
- AGTS – (i) Advanced Gunnery Training System
- AGU – (i) American Geophysical Union
- AGW – (i) Autonomous Guided Weapon
AH
- aH – (s) Attohenry
- Ah – (s) Ampere hour
- AH – (i) Attack Helicopter
- AHA – (i) American Heart Association
- AHCPR – (i) Agency for Health Care Policy and Research (obsolete; replaced with AHRQ)
- AHEC – (i) Australian Health Ethics Committee
- AHPCRC – (i) Army High Performance Computing Research Center
- AHQ – Air Headquarters
- AHRQ – (i) Agency for Healthcare Research and Quality
- AHS – (i)American Housing Survey
AI
- AI
- (i) Air Interdiction
- Amnesty International
- Artificial Insemination
- Artificial Intelligence
- (s) Anguilla (ISO 3166 digram)
- AIA
- (i) Aerospace Industries Association
- American Institute of Architects
- (s) Anguilla (ISO 3166 trigram)
- AIAA – (i) American Institute of Aeronautics and Astronautics
- AIC
- (i) African Independent Church
- Animal Identification Coordinator
- AICD – (i) Australian Institute of Company Directors
- AICMFP – (i) And I Claim My Five Pounds
- AID – (i) U.S. Agency for International Development
- AIDS – (a) Acquired Immune Deficiency Syndrome
- AIHW – Australian Institute of Health and Welfare
- AIM – many, including AOL Instant Messenger, Australian Institute of Management; see entry
- AIMP – (i) Aurora Incremental Modernization Project
- AIPAC – (i) American Israel Public Affairs Committee
- AIR – (i) Aircraft Inventory Record
- AIRFA – (a) American Indian Religious Freedom Act
- AIRS – (a/i) Aerometric Information Retrieval System (obsolete; replaced with AFS)
- AIS
- AISB – (i) (British) Society for the Study of Artificial Intelligence and the Simulation of Behaviour
AJ
- aJ – (s) Attojoule
- AJ – (s) Azerbaijan (FIPS 10-4 country code)
- Ajax – (a) Asynchronous JavaScript And XML
- AJD – (i) Astronomical Julian day
- AJP – (i) Allied Joint Publication
- AJPW – (i) All Japan Pro Wrestling
AK
- ak – (s) Akan languages (ISO 639-1 code)
- aK – (s) Attokelvin
- AK – (s) Alaska (postal symbol)
- aka – (s) Akan languages (ISO 639-2 code)
- a.k.a. – (i) Also known as (i.e.: alias)
- AKA – (i) Above knee amputation (orthopaedic usage)
- AKDT – (p) Alaska Standard Daylight Saving Time (UTC−8 hours)
- AKST – (p) Alaska Standard Time (UTC−9 hours)
- AKP – (i) Adalet ve Kalkınma Partisi (Turkish, "Justice and Development Party")
AL
- aL – (s) Attolitre
- Al – (s) Aluminium
- AL
- (s) Alabama (postal symbol)
- Albania (FIPS 10-4 country code; ISO 3166 digram)
- (i) Anno Lucis (Latin, "Year of Light", in Masonic tradition, most often seen on plaques bearing the founding dates of buildings, in years AD and years AL)
- ALA – (s) Åland (ISO 3166 trigram)
- ALAP – (a) As Long/Late As Possible
- ALARM – (a) Air-Launched Anti-Radar Missile
- ALB – (s) Albania (ISO 3166 trigram)
- ALCOA or Alcoa – The Aluminum Company of America, NYSE:AA
- ALD – (i) Accounting Line Designator (nuclear weapon targeting)
- ALERT – (a) Advanced Linked Extended Reconnaissance and Targeting – Attack and Launch Early Reporting to Theatre
- ALF
- (a) Africa Leadership Forum
- Alien Life Form (cf. ALF (TV series))
- Animal Liberation Front
- ALG – (s) Algeria (IOC and FIFA trigram, but not ISO 3166)
- ALGOL – (p) ALGOrithmic Language
- ALL – (s) Albanian lek (ISO 4217 currency code)
- ALOA – (i) Associated Locksmiths of America, Inc.
- ALOC
- (a) Air Lines Of Communication
- (a) Average Length of Calls
- ALP – (i) Australian Labor Party
- ALPA – (a) Air Line Pilots Association
- ALS – (i) Amyotrophic Lateral Sclerosis – Automatic Landing System
- ALSHS – (a) Abraham Low Self-Help Systems
- ALSP – (i) Aggregate Level Simulation Protocol
- ALTA – American Land Title Association
- ALTE – (a) Association of Language Testers in Europe
- ALTACS – (p) Automated decision Logic Tactical Air Combat Simulation
AM
- am
- (s) Amharic language (ISO 639-1 code)
- Attometre
- Am – (s) Americium
- AM
- many, including Amplitude Modulation and Ante Meridiem; see entry
- (s) Armenia (FIPS 10-4 country code; ISO 3166 digram)
- AM1 – Airman 1st class
- AMA
- AMAPS – (a) Aircraft, Missile, Avionics Performance Simulation
- AMC
- (i) Adaptive modulation and coding (digital communications)
- U.S. Air Mobility Command
- American Motors Corporation
- American Movie Classics (TV network; now known simply by the initials)
- U.S. Army Materiel Command
- AMCB – (i) U.S. Army/Marine Corps Board
- AMD
- (i) Advanced Micro Devices
- Age-related Macular Degeneration
- (s) Armenian dram (ISO 4217 currency code)
- AMF – (i) Afghan Military Force(s)
- AMFOM – (i) Advanced Missile Fly Out Model ("am-fomm")
- AMFR
- (i) Age-specific Marital Fertility Rate
- Amplitude Modulation Following Response
- AMFRS
- (i) Advanced Multi-Function Radio Frequency System
- Automatic Multisensor Feature-based Recognition System
- amh – (s) Amharic language (ISO 639-2 code)
- AML – (i) Acute Myeloid Leukaemia
- AMLCD – (i) Active Matrix Liquid Crystal Display
- AMLO
- (i) Andrés Manuel López Obrador (Mexican politician)
- Anti-Money Laundering Office — separate government agencies in Taiwan and Thailand
- AMO – (i) Atlantic Multidecadal Oscillation
- AMOLED – (i) Active-matrix organic light-emitting diode
- AMOS
- AMP
- (i) Adenosine MonoPhosphate
- Automated Mission Planner
- Anak ng Puta
- (i) Ain't My Problem
- AMRAAM – (a) Advanced Medium-Range Air-to-Air Missile
- AMRDEC – (i) U.S. Aviation & Missile Research, Development, & Engineering Center
- AMS
- AMSAA – (i/a) U.S. Army Materiel Systems Analysis Activity
- AMSB – (i) Aix Maurienne Savoie Basket (French basketball club)
- AMSO – (i/a) U.S. Army Model and Simulation Office
- AMSU – Advanced Microwave Sounding Unit
- AMTE – (i) UK Admiralty Marine Technology Establishment (1977–1984)
AN
- an – (s) Aragonese language (ISO 639-1 code)
- aN – (s) Attonewton
- AN
- (s) Andorra (FIPS 10-4 country code)
- Netherlands Antilles (ISO 3166 digram)
- ANA
- ANC – (i) African National Congress
- AND – (s) Andorra (ISO 3166 trigram)
- ANFO – (i) Ammonium nitrate/fuel oil (explosive)
- ANG
- (i) Air National Guard
- (s) Angola (IOC and FIFA trigram, but not ISO 3166)
- (s) Netherlands Antillian guilder (ISO 4217 currency code)
- ANGLiCo – (p) Air/Naval Gunfire Liaison Company
- ANL – (i) Argonne National Laboratory
- ANM – (i) Acoustic Noise Monitor
- ANOVA – (p) ANalysis Of VAriance
- ANS – (i) Applied and Natural Sciences
- ANSI – (a) American National Standards Institute
- ANTM – (i) America's Next Top Model
- ANT
- (s) Netherlands Antilles (ISO 3166 trigram)
- Antigua and Barbuda (IOC trigram, but not ISO 3166 or FIFA)
- ANTY – Acronyms, No Thank You
- ANWA – (i) Augusta National Women's Amateur, a prominent American golf tournament
- ANWR – (i) Arctic National Wildlife Refuge /ˈænwɑːr/
- ANZ – (s) Australia and New Zealand Banking Group
- ANZAC – (a) Australian and New Zealand Army Corps
AO
- AO
- (s) Angola (FIPS 10-4 country code; ISO 3166 digram)
- (i) Approach Officer (submarine)
- Area of Operations
- AOA
- (i) Air Officer in charge of Administration
- Argonne National Laboratory
- (s) Angolan kwanza (ISO 4217 currency code)
- (i) Award of Arms (heraldry)
- Angle of Attack (fluid dynamics)
- AOC
- (i) Air Operations Centre
- Air Officer Commanding
- Alexandria Ocasio-Cortez (American politician)
- AOC in C – Air Officer Commanding in Chief
- AOD – (i) Adrenalin O.D. (punk rock band)
- AOE – Area of Effect
- AOI
- AOL – (i) America OnLine
- AOR – (i) Area of Responsibility
- AOSTH – (i) Adventures of Sonic the Hedgehog
- AOTS – (i) Attack of the Show!
- AOU – (i) American Ornithologists' Union
AP
- AP
- (i) Advanced Placement
- Air Publication
- (s) Andhra Pradesh (Indian state code)
- (s) Armed Forces Pacific (postal symbol)
- (i) Associated Press
- Auto Pilot
- APA –
- (i) Acolytes Protection Agency (professional wrestling tag team)
- American Psychiatric Association
- American Psychological Association (see also APA style, a writing format developed by this body)
- APB – (i) All Points Bulletin (police jargon)
- APC
- (i) Armoured Personnel Carrier
- Armour Piercing Capped (ammunition)
- APEC – (a) Asia Pacific Economic Cooperation
- APCNR – (i) Armour-Piercing, Composite Non-Rigid (ammunition)
- APCR – (i) Armour-Piercing, Composite Rigid (ammunition)
- APDS – (i) Armour-Piercing, Discarding-Sabot (ammunition)
- APEDS – (a) AMSAA Performance Estimates Data System
- APEX – (p) Applied Physics Express
- APFSDS – (i) Armour-Piercing, Fin-Stabilised, Discarding Sabot (ammunition)
- APHA – (i) American Public Health Association
- APHE – (i) Armour-Piercing, High Explosive (ammunition)
- APHIS – (a) Animal and Plant Health Inspection Service
- API – (i) Application Programming Interface
- APL
- (i) A Programming Language
- Acute Promyeloid Leukaemia
- Anti-Personnel Landmine
- Applied Physics Laboratory (Johns Hopkins University)
- APM – (i) Advanced Power Management
- APNP – Advanced Practice Nurse Prescriber
- APOD – (i) Aerial Port (Airport) Of Debarkation
- APOE – (i) Aerial Port (Airport) Of Embarkation
- APOLLO – (a) Apache Point Observatory Lunar Laser-ranging Operation
- APP – (i) Allied Procedural Publication
- APR – (i) Annual Percentage Rate
- APS
- (i) Advanced Photo System (cf. APS-C, an image sensor format based on the size of the original APS film frame)
- American Physical Society
- Antiphospholipid Antibody Syndrome
AQ
- AQ
- (i) AdventureQuest
- (s) American Samoa (FIPS 10-4 territory code)
- Antarctica (ISO 3166 digram)
- (i) Automatic qualifier, a term used by U.S. sports media from 1998 to 2013 to refer to the six conferences whose champions automatically entered the now-defunct Bowl Championship Series of college football
- AQIM – (i) Al-Qaeda in the Islamic Maghreb
- AQPS – (i) Autre que pur-sang (French: "Other than Thoroughbred"), designation of a type of French racehorse
AR
- ar – (s) Arabic language (ISO 639-1 code)
- Ar – (s) Argon
- AR
- (s) Argentina (FIPS 10-4 country code; ISO 3166 digram)
- Arkansas (postal symbol)
- (i) ArmaLite Rifle (cf. ArmaLite AR-15 and AR-15 style rifle, both also referred to with the "AR" initialism)
- Armour
- (s) Arunachal Pradesh (Indian state code)
- ara – (s) Arabic language (ISO 639-2 code)
- ARAG – (a) Advanced Research and Assessment Group
- ARB – (i) Administrative Review Board
- ARBA – (a/i) Army Review Boards Agency
- ARC
- (i) Appalachian Regional Commission
- Arc-second Raster Chart
- (a) Association of Retarded Citizens, the original name of the organization now known as Arc of the United States
- (i) Athletics–Recreation Center, an indoor arena at Valparaiso University
- ARCA – (a) Automobile Racing Club of America
- ARCENT – (p) United States Army Central Command
- ARDA – (a) Advanced Research and Development Activity (became DTO 2006)
- ARE
- (i) UK Admiralty Research Establishment (1984–1991)
- (s) United Arab Emirates (ISO 3166 trigram)
- ARF – (i) ASEAN Regional Forum
- arg – (s) Aragonese language (ISO 639-2 code)
- ARG – (s) Argentina (ISO 3166 trigram)
- ARH – (s) Armed Reconnaissance Helicopter
- ARI
- (i) Acute Respiratory Infection
- U.S. Army Research Institute for the Behavioral and Social Sciences
- ARL
- (i) UK Admiralty Research Laboratory (1921–1977)
- U.S. Army Research Laboratory
- UIUC Aviation Research Laboratory
- ARM
- (a) Acorn RISC Machine, later Advanced RISC Machine (cf. Arm Ltd.)
- Anti-Radiation Missile
- Adjustable-rate mortgage
- (s) Armenia (ISO 3166 trigram)
- ARNet – (p) Acquisition Reform Network
- AROTS – Australian Rare Or Threatened Species
- ARP – (i) Address Resolution Protocol – Applied Research Programme
- ARPA – (a) Advanced Research Projects Agency
- ARRC – (i) ACE Rapid Reaction Corps
- ARRF – (i) Allied Rapid Reaction Force
- ARRL – (i) American Radio Relay League
- ARS
- (i) Agricultural Research Service
- (s) Argentine peso (ISO 4217 currency code)
- ARSC – (i) Arctic Region Supercomputing Center
- ARSPACE – (p) U.S. Army Space Command
- ART
- ARTCC – (i) Air Route Traffic Control Center
- ARWG – (i) Army Research Working Group ("are-wig")
AS
- as
- (i) Adult swim
- (s) Assamese language (ISO 639-1 code)
- Attosecond
- aS – (s) Attosiemens
- As – (s) Arsenic
- AS
- (s) American Samoa (postal symbol; ISO 3166 digram)
- Australia (FIPS 10-4 country code)
- Assam / Asom (Indian state code)
- Advanced Subsidiary (Subsidiary version of Advanced Level, 'A'-Level)
- AS – (i) ActionScript
- A/S – (i) Anti-submarine
- A&S – (i) Armament & Standardisation
- ASA
- ASAP – (a) As Soon As Possible
- ASARS
- (a) Advanced Synthetic Aperture Radar System
- Airborne Search and Rescue System
- ASB – (i) Associated Student Body – Alternative Service Book (Church of England)
- asbl – (i) association sans but lucratif (French "Non-profit organisation")
- ASBO – (a) Antisocial Behavior Order
- ASCAP – (a) American Society of Composers, Authors, and Publishers
- ASCC
- ASCIET – (i) All Services Combat Identification Evaluation Team
- ASCII – (a) American Standard Code for Information Interchange
- ASC+T – (i) Anti Slip Control + Traction
- ASD
- (i) (U.S.) Assistant Secretary of Defense
- Autism spectrum disorder
- ASD(C3I) – (i) (U.S.) (Command, Control, Communications, & Intelligence)
- ASD(FMP) – (i) (U.S.) Assistant Secretary of Defense (Force Management Policy)
- ASD(HA) – (i) (U.S.) Assistant Secretary of Defense (Health Affairs)
- ASD(ISA) – (i) (U.S.) Assistant Secretary of Defense (International Security Affairs)
- ASD(ISP) – (i) (U.S.) Assistant Secretary of Defense (International Security Policy)
- ASD(LA) – (i) (U.S.) Assistant Secretary of Defense (Legislative Affairs)
- ASD(PA) – (i) (U.S.) Assistant Secretary of Defense (Public Affairs)
- ASD(RA) – (i) (U.S.) Assistant Secretary of Defense (Reserve Affairs)
- ASD(SO&HA) – (i) (U.S.) Assistant Secretary of Defense (Special Operations & Humanitarian Assistance)
- ASD(SO/LIC) – (i) (U.S.) (Special Operations & Low-Intensity Conflict)
- ASD(S&R) – (i) (U.S.) Assistant Secretary of Defense (Strategy & Requirements)
- ASD(S&TR) – (i) (U.S.) Assistant Secretary of Defense (Strategy & Threat Reduction)
- ASDIC – (a) Allied Submarine Detection Investigation Committee (Sonar)
- ASEAN – (a) Association of Southeast Asian Nations
- ASFAR – (a) Americans for a Society Free of Age Restrictions
- ASG – (i) Area Support Group
- ASIC – (a) Australian Securities & Investments Commission – (a) Aviation Security Identification Card
- ASICS – (a) Anima sana in corpore sano (Latin, "A sound mind in a sound body") (athletic shoe manufacturer)
- ASIO
- ASIP
- (i) Advanced System Improvement Program
- Army Stationing and Installation Plan
- Application-specific instruction set processor
- ASL
- (i) Above Sea Level
- American Sign Language (also known as Ameslan)
- "Age, Sex, Location?" (Internet slang)
- asm – (s) Assamese language (ISO 639-2 code)
- ASM
- (i) Air-to-Surface Missile
- (s) American Samoa (ISO 3166 trigram)
- (i) American Society for Metals
- American Society for Microbiology
- Association Sportive Montferrandaise (French, "Clermont-Ferrand Sporting Association"), as in ASM Clermont Auvergne
- ASMB
- (i) American Society for Matrix Biology
- Adult Swim Message Board
- ASME
- ASMP
- (i) Air-Sol Moyenne Portée missile (French "Medium-range air to surface")
- (p) Asymmetric multiprocessing
- ASMR – Autonomous Sensory Meridian Response
- ASN – (i) Associate of Science in Nursing
- ASOC
- (a/i) Air Sovereignty Operations Centre
- Air Support Operations Centre
- Airport Security and Operations Centre
- Antarctic and Southern Ocean Coalition
- Atlanta Symphony Orchestra Chorus
- Australian Standard Offence Classification
- ASP
- ASPI – (i) Australian Strategic Policy Institute
- ASR
- ASRAAM – (a) Advanced Short-Range Air-to-Air Missile
- ASSC – (i) Association for the Scientific Study of Consciousness
- Ass Paym – Assistant Paymaster
- AST – (i) Atlantic Standard Time (UTC−4 hours)
- ASTIA – (a) Armed Services Technical Information Agency
- ASTM – (i) American Society for Testing and Materials
- ASTREA – (a) Aerial Support To Regional Enforcement Agencies (sheriff's air support unit)
- ASUN – (p) Atlantic Sun Conference, now branded as the ASUN Conference (pronounced "A-sun")
- ASUW – (p) AntiSUrface Warfare
- ASVAB–Armed Services Vocational Aptitude Battery (taken by juniors in high school in the USA)
- ASVEL – (a) Association Sportive Villeurbanne Éveil Lyonnais (Association Sportive is French for "Sporting Association"; the club was founded through the merger of AS Villeurbanne and Éveil Lyonnais)
- ASW – (i) AntiSubmarine Warfare
- ASWORG – (i) (U.S.) AntiSubmarine Warfare Operations Research Group
- ASX
AT
- aT – (s) Attotesla
- At – (s) Astatine
- AT – (i) Anti-Tank – (s) Ashmore and Cartier Islands (FIPS 10-4 territory code) – Austria (ISO 3166 digram) – (i) Advanced Technology (IBM Personal Computer/AT)
- ATA – (i) Advanced Technology Attachment (IBM Personal Computer) – Afghan Transitional Authority – Allen Telescope Array – (s) Antarctica (ISO 3166 trigram)
- ATAC – (a) Air Transportable Acoustic Communications
- ATACMS – (p) Army TACtical Missile System
- ATAPI – (a) Advanced Technology Attachment Packet Interface
- ATAS – (a) Air-To-Air Stinger (missile)
- ATAT – (a) Aiken Tactical Airsoft Team / Star Wars vehicle
- ATB
- (i) Active Time Battle
- (s) British Antarctic Territory (ISO 3166 trigram; merged with AQ in 1979)
- ATC –
- (i) Air Traffic Control
- Air Training Corps
- U.S. Air Transport Command (1942–1948)
- Athletic Trainer, Certified (www.nata.org)
- ATCCIS – (i) Army Tactical Command and Control Information System
- ATEBAWLS – (a) Association Towards Engineers Balling at Wii Lover's Sports
- ATESS – (i) Aerospace and Telecommunications Engineering Support Squadron
- ATF
- (s) French Southern Territories (ISO 3166 trigram)
- (i) (U.S.) Bureau of Alcohol, Tobacco, Firearms and Explosives (from its previous name, which did not include "Explosives")
- ATG – (s) Antigua and Barbuda (ISO 3166 and FIFA trigram)
- ATGM – (i) Anti-Tank Guided Missile
- ATGW – (i) Anti-Tank Guided Weapon
- ATI –
- (i) Allied Telesyn International, Inc.
- (a) Array Technologies Incorporated. (ATI Technologies)
- Air Transport International - American cargo airline
- Atisbo – a Local Government Area in Nigeria named for constituent communities (Ago-Are, Tede, Irawo, Sabe, Baasi, Ofiki and Owo)
- ATK – (p) Attack
- ATL – (p) Atlanta, Georgia, the largest city and capital of Georgia; taken from the IATA code for its airport
- ATLAS –
- (a) All-Terrain Lifter Army System
- (p) Assessment Tool for LAnd Systems
- ATM –
- (i) Automated Teller Machine
- Asynchronous Transfer Mode
- At The Moment
- ATN – (s) Dronning Maud Land (ISO 3166 trigram; merged with AQ in 1983)
- ATO
- ATP
- (i) Adenosine TriPhosphate
- Allied Tactical Publication
- Ammunition Transfer Point
- Association of Tennis Professionals (cf. ATP Tour, ATP Challenger Tour, ATP Champions Tour)
- ATSD – (p) (U.S.) Assistant Secretary of Defense
- ATSDR – (i) Agency for Toxic Substances and Disease Registry
- AT&T – (i) American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
- ATV
- (i) All-terrain vehicle
- Associated Television – former UK TV company
- ATWA – (a) Air, Trees, Water, Animals
AU
- Au – (s) Gold (Latin Aurum)
- AU –
- (i) African Union (was OAU before 2000)
- American University
- (s) Astronomical Unit
- Australia (ISO 3166 diagram)
- Austria (FIPS 10-4 country code)
- AUC –
- (i) Ab Urbe Condita / Anno Urbis Conditae (Latin "from the founding of the city" / "in the year since the founding of the city") (of Rome)
- Area Under the Curve (concentration time curve; medicine)
- AUD – (s) Australian dollar (ISO 4217 currency code)
- AUG – (a) Armee-Universal-Gewehr (German, Army Universal Rifle)
- AUS – (s) Australia (ISO 3166 trigram)
- AUSCANNZUKUS – (p) Australia, Canada, New Zealand, United Kingdom, United States (security designation)
- Auslan – (p) Australian Sign Language
- AUT – (s) Austria (ISO 3166 trigram)
- AUTL – (i) Army Universal Task List
AV
- av – (s) Avar language (ISO 639-1 code)
- aV – (s) Attovolt
- Av – (i) Aperture value (photographic mode)
- AV
- (s) Anguilla (FIPS 10-4 territory code)
- (i) Audio-Visual
- (s) Aviation
- ava – (s) Avar language (ISO 639-2 code)
- AVA – (i) American Viticultural Area
- AVB – (i) Audio Video Bridging
- AVCATT-A – (p) (U.S. Army's) Aviation Combed Arms Tactical Trainer-Aviation [Reconfigurable Manned Simulator]
- AVDLR – (p) Aviation Depot Level Repair
- ave – (s) Avestan language (ISO 639-2 code)
- AVGP – (i) Armoured Vehicle, General Purpose
- AVI – (i) Audio Video Interleave
- AVIM – (p) Aviation Intermediate Maintenance
- AVLB – (i) Armoured Vehicle Launched Body
- AVM
- AVO – (i) Apprehended Violence Order
- AVP – (a) Arubaanse Volkspartij
- AVP – (i) Association of Volleyball Professionals
- AVRE – (i) Armoured Vehicle Royal Engineers
- AVTB
- (i) Armoured Vehicle Test Bed
- (p) Aviation Test Bed
- AVUM – (p) Aviation Unit Maintenance
- AVUS – (a) Automobil-Verkehrs- und Übungsstraße (German, "Automobile Traffic and Training Road"; former auto racing track and current road in Berlin)
- AVVO – (a) Acute Vaginal Venereal Outbreak
AW
- aW – (s) Attowatt
- AW – (s) Aruba (ISO 3166 digram)
- AWA – (i) American Wrestling Association
- AWACS – (a) Airborne Warning And Control System
- AWC – (i) Air Warfare Centre
- AWD – many, including All Wheel Drive; see entry
- AWE – (i/a) Advanced Warfighting Experiment
- AWG – (s) Aruban guilder (ISO 4217 currency code)
- AWOL – (a) Absent Without Official Leave / Absent WithOut Leave (military jargon)
- AWP – (p) Awaiting Parts (SM&R code)
- AWSIM – (p) Air Warfare SIMulation
- AWST – (a) Australian Western Standard Time
- AWW – (i) Above-Water Warfare
AX
AY
- ay – (s) Aymara language (ISO 639-1 code)
- AY – (s) Antarctica (FIPS 10-4 territory code)
- AYBABTU – (i) All Your Base Are Belong To Us
- aym – (s) Aymara language (ISO 639-2 code)
- AYU – (i) As Yet Unknown
AZ
- az – (s) Azerbaijani language (ISO 639-1 code)
- AZ
- (s) Arizona (postal symbol)
- Azerbaijan (ISO 3166 digram)
- (i) Alkmaar Zaanstreek (Dutch football club)
- AZAL – Azerbaijan Airlines
- aze – (s) Azerbaijani language (ISO 639-2 code)
- AZE – (s) Azerbaijan (ISO 3166 trigram)
- AZN – (s) Azerbaijani manat (ISO 4217 currency code)
- AZUR – (p) Actions en zone urbaine (French, Urban Operations)
🔥 Top keywords: Main PageSpecial:SearchPage 3Wikipedia:Featured picturesHouse of the DragonUEFA Euro 2024Bryson DeChambeauJuneteenthInside Out 2Eid al-AdhaCleopatraDeaths in 2024Merrily We Roll Along (musical)Jonathan GroffJude Bellingham.xxx77th Tony AwardsBridgertonGary PlauchéKylian MbappéDaniel RadcliffeUEFA European Championship2024 ICC Men's T20 World CupUnit 731The Boys (TV series)Rory McIlroyN'Golo KantéUEFA Euro 2020YouTubeRomelu LukakuOpinion polling for the 2024 United Kingdom general electionThe Boys season 4Romania national football teamNicola CoughlanStereophonic (play)Gene WilderErin DarkeAntoine GriezmannProject 2025