| American Astrophysical Society | Academic & Science |
| American Astronautical Society | Academic & Science |
| Academic Advising Services | Academic & Science |
| American Auditory Society | Academic & Science |
| Associate of Applied Science | Academic & Science |
| Atelier Architecture Scenography | Academic & Science |
| Österreichische Akademie der Wissenschaften | Academic & Science |
| Asociación Argentina de Sedimentología | Academic & Science |
| Archaeology, Astronautics, and Seti | Academic & Science |
| Advanced Antenna Systems | Academic & Science |
| Atelier Architecture and Scenography | Academic & Science |
| Associate in Applied Sciences | Academic & Science |
| Associates in Applied Science | Academic & Science |
| Australian Academy of Science | Academic & Science |
| Assyrian Academic Society | Academic & Science |
| African Academy of Sciences | Academic & Science |
| Argentine Association of Sedimentology | Academic & Science |
| Asociación Argentina de Sedimentología | Academic & Science |
| Academy of Arts Sciences | Academic & Science |
| Associate of Arts and Sciences | Academic & Science |
| Anno Aetatis Suae (Died in the year of (his/her) age) | Academic & Science |
| American Antiquarian Society | Academic & Science |
| Australian Accounting Standard | Accounts and Finance |
| Apalapsili | Airport Code |
| Amerisource Health Corporation | Business |
| Automated Accounting System | Business |
| Anti Amber Squad | Business |
| Aberdeen Asian Smaller Companies Investment Trust, P.L.C. | Business |
| American Astronomical Society | Business |
| Asian Pacific, LTD. | Business |
| Atomic Absorption Spectrometry | Chemistry |
| Atomic Absorption Spectrophometer | Chemistry |
| Anytime Anywhere School | Community |
| Arnold Air Society | Community |
| American Archaeological Society | Community |
| American Association of Suicidology | Community |
| Almost A Star | Community |
| All About Symbian | Community |
| American Academy of Sciences | Community |
| Association for Asian Studies | Community |
| Association of Amherst Students | Community |
| Ascii Adjust After Subtraction | Computer Assembly Language |
| Address Allocation Server | Computing |
| Advanced Antenna System | Computing |
| Application Analysis Solution | Computing |
| Apple App Store | Computing |
| As A Service | Computing |
| Advanced Analytics Specialist | Computing |
| Azure Analysis Service | Computing |
| Average Active Sessions | Computing |
| Average Access Speed | Computing |
| All to All Scatter | Computing |
| Automatic Addressing System | Computing |
| Authorware Shocked Packet | Computing |
| Associate of Applied Sciences | Educational Degree |
| Associate In Applied Science | Educational Degree |
| Atomic Absorption Spectroscopy | Electronics |
| Always A Solution | General |
| Advanced Authoring System | General |
| Application Address Space | General |
| Advance And Secure | General |
| Anabolic Androgen Steroid | General |
| All Around Style | General |
| Advanced Automation Systems | General |
| Adagio Audio Server | General |
| Arms Abs and Shoulders | General |
| Arrogance, Apostasy, and Stupidity | General |
| Austin American Statesman | General |
| Applied Acoustics Systems | General |
| Angle Angle Side | General |
| Anywhere Anytime Service | General |
| Acta Apostolicae Sedis | General |
| Aquatic Agricultural Systems | General |
| Amazing Animal Service | General |
| Amputee Activity Score | General |
| Assessment Administration Specialist | General |
| All American Selection | General |
| Adaptive Air Suspension | General |
| Automatic Adjusting Suspension | General |
| Air Adjusting Screw | General |
| Automobile Association of Singapore | General |
| Auto Adjustment System | General |
| Auxiliary Alarm Sensor | General |
| Automotive Aerodynamics and Safety | General |
| American Automotive Summit | General |
| Advanced Automotive Services | General |
| Albany Auto Show | General |
| Alfa Active Suspension | General |
| Agence Automobile du Sud | General |
| Autoliv Asia | General |
| Airport Advisory Service | Governmental |
| Analysis of Alternatives Study | Governmental |
| Aerospace Advocates Society | Governmental |
| ASRANADA | Indian Railway Station |
| Asian American Studies | International |
| Acta Apostolica Sedis | International |
| Average Annual Salary | Jobs |
| Asymptotically Almost Surely | Maths |
| Auto Available Split | Maths |
| Aching Arm Syndrome | Medical |
| Almelo Ayurveda Silva | Medical |
| Anabolic Androgenic Steroid | Medical |
| Alive And Smiling | Medical |
| Androgenic Anabolic Steroids | Medical |
| Anabolic Androgenic Steroids | Medical |
| Anabolic And Androgenic Steroids | Medical |
| Anabolic Androgenic Steriod | Medical |
| Association for Academic Surgery | Medical |
| Acute Abdominal Series | Medical |
| Abdominal Aortic Surgery | Medical |
| Associate of Applied Science in Nursing | Medical |
| Abuse Assessment Screen | Medical |
| Acid Aspiration Syndrome | Medical |
| AIDS Attitude Scale amino acid sequence | Medical |
| Alcohol Abstinence Syndrome | Medical |
| Alcohol Action Service | Medical |
| allergic Aspergillus sinusitis | Medical |
| Androgenic Anabolic Steroid | Medical |
| Aneurysm of Atrial Septum | Medical |
| Ann Arbor Staging | Medical |
| Aortic Arch Syndrome | Medical |
| Associate Applied Science | Medical |
| atlantoaxial subluxation | Medical |
| Atomic Absorption Spectophotometry | Medical |
| Australian Association of Surgeons | Medical |
| Alert Area Supervisor | Military and Defence |
| Army Apprentices School | Military and Defence |
| Advanced Automation System | Military and Defence |
| Atomic Absorption Spectrophotometry | Physics Related |
| All America Selection | Sports |
| All America Selections | Sports |
| Adaptive Antenna System | Telecommunication |
