List of Acronyms and Initialisms: A - AA

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
• 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"—Mexican professional wrestling promotion)
• AAAI – (i) American Association for Artificial Intelligence
• AAAS – (i) American Association for the Advancement of Science
• AAAV – (i) Advanced Amphibious Assault Vehicle
• AAC – (i) Army Air Corps (British Army)
• AAD
  • (i) analogue-analogue-digital (CD quality)
  • Australian Antarctic Division
• AADD – Adult attention deficit 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