| Acronym | Definition |
|---|
| AOS | American Orchid Society |
| AOS | Adjustment of Status |
| AOS | Area of Study |
| AOS | Associate of Occupational Studies |
| AOS | A.O. Smith Corp. (Milwaukee, WI) |
| AOS | Acquisition Of Signal |
| AOS | American Oriental Society |
| AOS | Apparent Opening Size (US standard sieve) |
| AOS | Austin Osman Spare (artist) |
| AOS | Aria of Sorrow (game) |
| AOS | Area Of Specialization |
| AOS | Apraxia of Speech |
| AOS | Application Object Server |
| AOS | Armed Offenders Squad (New Zealand) |
| AOS | Add Or Subtract |
| AOS | American Orthodontic Society |
| AOS | Australian Optical Society |
| AOS | American Otological Society |
| AOS | Automated Office Systems (Bellcore) |
| AOS | Alcatel Operating System |
| AOS | Algebraic Operating System |
| AOS | Adams-Oliver Syndrome |
| AOS | Athabasca Oil Sands (crude oil deposits; Alberta, Canada) |
| AOS | Axis of Symmetry |
| AOS | Area of Service (Sprint) |
| AOS | Arrived on Scene |
| AOS | Alternate Operator Service |
| AOS | area of separation (US DoD) |
| AOS | Academic Orthopaedic Society |
| AOS | Aeon of Strife (gaming) |
| AOS | Associates of Science (degree) |
| AOS | Agreement Of Sale |
| AOS | Age d'Or Services (French: Golden Age Services) |
| AOS | Acousto-Optic Spectrometer |
| AOS | Average Order Size |
| AOS | All Options Stink |
| AOS | Air Operations Squadron |
| AOS | Add One and do not Skip |
| AOS | Advanced Orbiting System |
| AOS | Automated Ordering System |
| AOS | Actualités Odonto-Stomatologiques (French medical journal) |
| AOS | Arquitectura Orientada a Servicios (Spanish: service-oriented architecture) |
| AOS | Aerosol Observing System |
| AOS | Add-On Stabilization |
| AOS | Any Other Score |
| AOS | Associate Opinion Survey |
| AOS | Add On Sales |
| AOS | Arrival on Site |
| AoS | Army of Sin (game clan) |
| AOS | Avionics Operating System |
| AOS | Airborne Optical System |
| AOS | Age Old Saying |
| AOS | Ages of Shadows (game) |
| AOS | Airport Operations Specialist |
| AOS | Automated Operating System |
| AOS | Airborne Optical Sensor |
| AOS | Airlift Operations School |
| AOS | Air Observer's School |
| AOS | Arithmetic Operating System |
| AOS | Alternate Option Selection |
| AOS | Archaic of Styles (band) |
| AOS | Atlantic Oceanographic Synopsis |
| AOS | American Ostomy Supply (Waukesha, WI) |
| AOS | Acronym Overload Syndrome :-) |
| AOS | FAA Operational Support Service |
| AOS | Automated Observation System (US DoD) |
| AOS | Application Outsourcing Service |
| AOS | Azimuth Orientation System |
| AOS | Aircraft on Station |
| AOS | Adaptive Order Statistic |
| AOS | Access Optimization Service (UUNET) |
| AOS | Airborne Optical Surveillance |
| AOS | Aurora Optical Switch (Tellium) |
| AOS | Advanced Online Search |
| AOS | Astronomiczne Obserwatorium Scerokosciowe (Borowcu, Poland Time Standard) |
| AOS | Support Tankers |
| AOS | Automatic/Automatically Out of Service (Tandem & DSC) |
| AOS | ATl Optical Summit (Sprint) |
| AOS | Automated Observing Station |
| AOS | Airport Operation System (airport management software) |
| AOS | Application Ordering System (student financial aid) |
| AOS | Aviators Oxygen System |
| AOS | Alternate Observing Site |
| AOS | Aircrew Oxygen System |
| AOS | Activism Orientation Scale (Corning and Myers, 2002) |
| AOS | Alpha Olefin Sulfonate |
| AOS | Alabama Ornithological Society (est. 1952) |
| AOS | Administrative and Operational Services (various organizations) |
| AOS | Atmosphere Ocean System |