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List of acronyms: A

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This list contains acronyms, initialisms, and pseudo-blends that begin with the letter A.

An acronym is an abbreviation pronounced as a series of constituent letters; an initialism is an abbreviation whose pronunciation is wholly or partly the names of constituent letters; and a pseudo-blend is an abbreviation whose extra or omitted letters means that it cannot be considered a true acronym, initialism, or portmanteau (a word formed by combining two or more words).

(a) = acronym in the example: SARS - (a) Severe acute respiratory syndrome
(i) = initialism in the example: CD - (i) Compact disc
(p) = pseudo-blend in the example: UNIFEM - (p) United Nations Development Fund for Women
(s) = symbol (none of the above, stands for and is read as something else; for example: MHz - Megahertz)

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Please add your own, in a quasi-dictionary order with lowercase treated the same as uppercase and ignoring non-alphanumeric characters (hyphens and such). This means that only alphanumeric characters have any significance in determining order, and that lowercase letters occupy the same ordering position as uppercase (in tie-breaker cases, list lower case first). For example: Algol appears before ALS. (This differs from a strict ASCII ordering.)


  • A - (s) Ampere
  • 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

AA

AB

AC

AE

  • AE - (s) Armed Forces Africa/Canada/Europe/Middle East (postal symbol) - United Arab Emirates (ISO 3166 digram)
  • AEF - (i) American Expeditionary Force
  • AEGIS - (p) Airborne Early warning Ground environment Interface Segment
  • AEI-T - (i) Army Enterprise Infostructure-Transport
  • aeq. - (p) aequalis (Latin, "equal")
  • AESR - (i) Aeronautical Equipment Service Record
  • aet. - (p) aetatis (Latin, "of age", "aged")
  • AEW - (i) Airborne Electronic Warfare - Airborne Early Warning

AF

AG

AH

AI

AJ

AK

  • AK - (s) Alaska (postal symbol)
  • aka - (i) also known as
  • AKDT - (p) Alaska Standard Daylight Saving Time (UTC-8 hours)
  • AKST - (p) Alaska Standard Time (UTC-9 hours)

AL

AM

AN

AO

AP

AQ

AR

AS

AT

AU

AV

  • AV - (i) Audio-Visual - (s) Aviation
  • AVCATT-A - (p) (U.S. Army's) Aviation Combined Arms Tactical Trainer-Aviation [Reconfigurable Manned Simulator]
  • AVDLR - (p) Aviation Depot Level Repair
  • AVGP - (i) Armoured Vehicle, General Purpose
  • AVI - (i) Audio Video Interleave
  • AVIM - (p) Aviation Intermediate Maintenance
  • AVO - (i) Apprehended Violence Order
  • AVTB - (i) Armoured Vehicle Test Bed
  • AVUM - (p) Aviation Unit Maintenance

AW

AX

AY

  • AYU - (i) As Yet Unknown

AZ

See also

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