noun

• (medicine) Initialism of abdominal aortic aneurysm.
• (organic chemistry) Initialism of aromatic amino acid.
• (military) Initialism of anti-aircraft artillery.
• (psychology) Initialism of animal-assisted activity.
• Initialism of advanced acoustic array.
• Initialism of Access Approval Authority.
• Initialism of accumulated adjustments account, in US Federal Income Tax
• Initialism of adaptive array antenna.
• Initialism of airborne assault area.
• Initialism of aircraft alert area.
• Initialism of airport airspace analysis.
• Initialism of angle angle angle, a geometric proof
• Initialism of arrival and assembly area.
• Initialism of astronaut-actuated abort.
• Initialism of attitude, awareness and accountability, a ski safety program [The position of the body or way of carrying oneself.]
• Initialism of authentication, authorization and accounting. [something which validates or confirms the authenticity of something]
• Initialism of automated airlift analysis.
• Initialism of administration, authorization, and authentication, in software security [(uncountable) The act of administering; government of public affairs; the service rendered, or duties assumed, in conducting affairs; the conducting of any office or employment; direction.]
• Initialism of AEGIS acquisition agent.
• Initialism of aerospace engineering, applied mechanics, and aviation. [(engineering) The primary branch of engineering concerned with the research, design, development, construction, testing, science, and technology of aircraft and spacecraft.]
• Initialism of air avenue of approach.
• Initialism of airborne array aperture.
• Initialism of allocations, assessments, and analysis.
• Initialism of alternate assembly area.
• Initialism of authorization accounting activity; authorized accounting activity.
• Initialism of Acquisition Approval Authority.
• (US, historical, law) Initialism of Agricultural Adjustment Act.
• (US, historical, law) Initialism of Agricultural Adjustment Administration.
• (US) Initialism of American Anthropological Association.
• Initialism of Abortion Assistance Association.
• Initialism of All American Aviation.
• Initialism of Allegheny Airlines.
• (UK, art, historical) Initialism of Allied Artists Association.
• Initialism of Allied Artists of America.
• Initialism of American Abstract Artists.
• (historical) Initialism of American Academy of Allergy; now the AAAAI.
• Initialism of American Academy of Actuaries.
• Initialism of American Academy of Advertising.
• Initialism of American Accordionists' Association.
• Initialism of American Accounting Association.
• Initialism of American Airship Association.
• Initialism of American Ambulance Association.
• Initialism of American Antarctic Association.
• Initialism of American Arbitration Association.
• Initialism of American Association for Anatomy.
• Initialism of American Astronomers Association.
• Initialism of American Australian Association.
• (US, automotive) Initialism of American Automobile Association.
• Initialism of Access All Areas, Sony music project.
• (US, historical) Initialism of Actors and Artistes of America; now the AAAA or 4As.
• Initialism of Agricultural Aviation Association.
• Initialism of Agricultural Adjustment Association.
• (England) Initialism of Amateur Athletic Association of England.
• Initialism of Antique Airplane Association.
• Initialism of Appraisers Association of America.
• Initialism of Archives of American Art.
• Initialism of Association of Accounting Administrators.
• Initialism of Association of Average Adjusters.
• Initialism of Armenian Assembly of America.
• Initialism of Argentine Anticommunist Alliance.
• Initialism of ANSI Artists of America.
• Initialism of Area-Agency on Aging.
• Initialism of Army Athletic Association.
• (US, dated)Initialism of Army Audit Agency; more commonly the USAAA.
• Initialism of Associated Agents of America.
• (dated) Initialism of Australian Association of Accountants.
• (Australia, automotive) Initialism of Australian Automobile Association.
• (medicine) Initialism of acquired aplastic anemia.
• (medicine) Initialism of acute anxiety attack.
• (medicine) Initialism of amalgam. [(metallurgy) An alloy containing mercury.]
• (medicine) Initialism of androgenic anabolic agent.