Definitions from Wiktionary (Aaa)

▸ noun:  (medicine) Initialism of abdominal aortic aneurysm.
▸ noun:  (organic chemistry) Initialism of aromatic amino acid.
▸ noun:  (military) Initialism of anti-aircraft artillery.
▸ noun:  (psychology) Initialism of animal-assisted activity.
▸ noun:  Initialism of adult album alternative. [A radio format combining various styles of pop and rock with new wave, jazz, etc., but generally excluding hard rock and rap.]
▸ noun:  Initialism of advanced acoustic array.
▸ noun:  Initialism of Access Approval Authority.
▸ noun:  Initialism of accumulated adjustments account, in US Federal Income Tax
▸ noun:  Initialism of adaptive array antenna.
▸ noun:  Initialism of airborne assault area.
▸ noun:  Initialism of aircraft alert area.
▸ noun:  Initialism of airport airspace analysis.
▸ noun:  Initialism of angle angle angle, a geometric proof
▸ noun:  Initialism of arrival and assembly area.
▸ noun:  Initialism of astronaut-actuated abort.
▸ noun:  Initialism of attitude, awareness and accountability, a ski safety program [The position of the body or way of carrying oneself.]
▸ noun:  Initialism of authentication, authorization and accounting. [something which validates or confirms the authenticity of something]
▸ noun:  Initialism of automated airlift analysis.
▸ noun:  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.]
▸ noun:  Initialism of AEGIS acquisition agent.
▸ noun:  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.]
▸ noun:  Initialism of air avenue of approach.
▸ noun:  Initialism of airborne array aperture.
▸ noun:  Initialism of allocations, assessments, and analysis.
▸ noun:  Initialism of alternate assembly area.
▸ noun:  Initialism of authorization accounting activity; authorized accounting activity.
▸ noun:  Initialism of Acquisition Approval Authority.
▸ noun:  (US, historical, law) Initialism of Agricultural Adjustment Act.
▸ noun:  (US, historical, law) Initialism of Agricultural Adjustment Administration.
▸ noun:  (US) Initialism of American Anthropological Association.
▸ noun:  Initialism of Abortion Assistance Association.
▸ noun:  Initialism of All American Aviation.
▸ noun:  Initialism of Allegheny Airlines.
▸ noun:  (UK, art, historical) Initialism of Allied Artists Association.
▸ noun:  Initialism of Allied Artists of America.
▸ noun:  Initialism of American Abstract Artists.
▸ noun:  (historical) Initialism of American Academy of Allergy; now the AAAAI.
▸ noun:  Initialism of American Academy of Actuaries.
▸ noun:  Initialism of American Academy of Advertising.
▸ noun:  Initialism of American Accordionists' Association.
▸ noun:  Initialism of American Accounting Association.
▸ noun:  Initialism of American Airship Association.
▸ noun:  Initialism of American Ambulance Association.
▸ noun:  Initialism of American Antarctic Association.
▸ noun:  Initialism of American Arbitration Association.
▸ noun:  Initialism of American Association for Anatomy.
▸ noun:  Initialism of American Astronomers Association.
▸ noun:  Initialism of American Australian Association.
▸ noun:  (US, automotive) Initialism of American Automobile Association.
▸ noun:  Initialism of Access All Areas, Sony music project.
▸ noun:  (US, historical) Initialism of Actors and Artistes of America; now the AAAA or 4As.
▸ noun:  Initialism of Agricultural Aviation Association.
▸ noun:  Initialism of Agricultural Adjustment Association.
▸ noun:  (England) Initialism of Amateur Athletic Association of England.
▸ noun:  Initialism of Antique Airplane Association.
▸ noun:  Initialism of Appraisers Association of America.
▸ noun:  Initialism of Archives of American Art.
▸ noun:  Initialism of Association of Accounting Administrators.
▸ noun:  Initialism of Association of Average Adjusters.
▸ noun:  Initialism of Armenian Assembly of America.
▸ noun:  Initialism of Argentine Anticommunist Alliance.
▸ noun:  Initialism of ANSI Artists of America.
▸ noun:  Initialism of Area-Agency on Aging.
▸ noun:  Initialism of Army Athletic Association.
▸ noun:  (US, dated)Initialism of Army Audit Agency; more commonly the USAAA.
▸ noun:  Initialism of Associated Agents of America.
▸ noun:  (dated) Initialism of Australian Association of Accountants.
▸ noun:  (Australia, automotive) Initialism of Australian Automobile Association.
▸ noun:  (medicine) Initialism of abdominal aortic aneurysm.
▸ noun:  (medicine) Initialism of acquired aplastic anemia.
▸ noun:  (medicine) Initialism of acute anxiety attack.
▸ noun:  (medicine) Initialism of amalgam. [(metallurgy) An alloy containing mercury.]
▸ noun:  (medicine) Initialism of androgenic anabolic agent.
▸ noun:  (military) Initialism of anti-aircraft artillery.

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