(Main list of acronyms)
a – (s) Atto- A – (s) Ampere
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 Conference
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 (i) American Athletic Conference Army Air Corps (British Army) 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 (i) after-action review Association of American Railroads 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 (i) Adriatic Basketball Association American Bar Association American Basketball Association American Beverage Association American Bicycle Association American Birding Association Australian Broadcasting Authority 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 Control (or 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 (i) acrylonitrile butadiene styrene anti-lock braking system 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 (a) Aboriginal Children's Advancement Society Advisory, Conciliation and Arbitration Service ACB – (i) Asociación de Clubes de Baloncesto (Spanish for "Association of Basketball Clubs") ACC (i) U.S. Air Combat Command Air Component Commander Alpine Club of Canada Altocumulus castellanus Area control center Atlantic Coast Conference Automatic climate control 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 (a) Apple Certified Desktop Technician (a) Australian Central Daylight Time ACE (a) Air Combat Emulator (computer game) Allied Command Europe Angiotensin-converting enzyme Armored Combat Earthmover Automatic Computing Engine 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 (i) Administration for Children and Families American Car and Foundry American Culinary Federation 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 (i) ACNA (company) - National Dyes Company and Affiliates ACO – (i) Airspace Control Order ACOBA – (a) Advisory Committee on Business Appointments ACOG (a) Advanced Combat Optical Gunsight (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 (i) Abilene Christian University American Conservative Union ACUF (i) BGN Advisory Committee on Undersea Features (a) American Conservative Union Foundation 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) Analog to Digital Converter 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 (i) Algebraic differential equation Antibody-dependent enhancement ADF