AAA

Initialism of abdominal aortic aneurysm.

Initialism of aromatic amino acid.

Initialism of anti-aircraft artillery.

Initialism of animal-assisted activity.

Initialism of adult album alternative.

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.

Initialism of authentication, authorization and accounting.

Initialism of automated airlift analysis.

Initialism of administration, authorization, and authentication, in software security.

Initialism of AEGIS acquisition agent.

Initialism of aerospace engineering, applied mechanics, and aviation.

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.

Initialism of Agricultural Adjustment Act.

Initialism of Agricultural Adjustment Administration.

Initialism of American Anthropological Association.

Initialism of Abortion Assistance Association.

Initialism of All American Aviation.

Initialism of Allegheny Airlines.

Initialism of Allied Artists Association.

Initialism of Allied Artists of America.

Initialism of American Abstract Artists.

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.

Initialism of American Automobile Association.

Initialism of Access All Areas, Sony music project.

Initialism of Actors and Artistes of America; now the AAAA or 4As.

Initialism of Agricultural Aviation Association.

Initialism of Agricultural Adjustment Association.

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.

Initialism of Army Audit Agency; more commonly the USAAA.

Initialism of Associated Agents of America.

Initialism of Australian Association of Accountants.

Initialism of Australian Automobile Association.

The highest level of minor league baseball, often used by extension in other sports to indicate the highest level of minor league play in that sport as well.

A very narrow shoe size.

The highest credit rating given by debt analysis agencies such as Standard & Poor's, Moody's, and A.M. Best.

high-quality video game expected to sell well, typically with a large development budget.

Initialism of awaiting aircraft availability.