List of acronyms: A

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)

(Main list of acronyms)

A0–9
  • A1C – Airman First Class
  • A2ATD or A2ATD – (i) Anti-Armour Advanced Technology Demonstration
  • A2C2 or A2C2 – (i) Army Airspace Command and Control
  • A4 – many, including a European standard office paper size; see entry
  • A10 – (i) Atlantic 10 Conference

AA

AB

AC
  • 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)
  • 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
  • ADC – (i) Aide De Camp – U.S. Air Defense Command (1946–1992) – Apple Display Connector – Program Against Digital Counterfeiting of Currency
  • 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
  • ADF – (i) Australian Defence Force – African Development Foundation
  • 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 – (a/i) Active Denial System – Astrophysics Data System – Attention Deficit Syndrome
  • ADSR – (i) Attack, Decay, Sustain, Release (sound envelope specification)
  • ADT – (i) 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
  • 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

AF

AG

AH

AI

AJ

AK

AL

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
  • AMCB – (i) U.S. Army/Marine Corps Board
  • AMD
  • 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
  • AMO – (i) Atlantic Multidecadal Oscillation
  • AMOLED – (i) Active-matrix organic light-emitting diode
  • AMOS
  • AMP
    • (i) Adenosine MonoPhosphate
    • Automated Mission Planner
  • 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
  • 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

AO

AP

AQ

AR

AS

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
  • 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)
  • 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
  • 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 – (i) Air Tasking Order – Australian Taxation Office
  • ATP – (i) Adenosine TriPhosphate – Allied Tactical Publication – Ammunition Transfer Point
  • 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
  • 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 digram) – 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)
  • 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

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
  • AX – (s) Åland Islands (ISO 3166 digram)
  • AXP – (p) Ambulance eXchange Point

AY

AZ
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