| Abbreviation | Definition |
|---|---|
| AOO | American Oceanographic Organization |
| AOP | Affiliate Outreach Project |
| AOP | Advanced Oxidation Processes |
| AOP | Autonomous Object Platform |
| AOP | Aspect Oriented Programming |
| AOP | Agent-Oriented Programming |
| AOP | Annual Operational Plan |
| AOPA | Aircraft Owners and Pilots Association |
| AOPC | Agency Organization Program Coordinator |
| AOPL | Association of Oil Pipe Lines |
| AOQL | Average Outgoing Quality Level |
| AOR | Operations Research Service |
| AOR | Address Of Record |
| AORP | Advanced oxidation/Reduction Process |
| AOS | Adaptive Optimization System |
| AOS | Area Of Specialty |
| AOS | Adjustment Of Status |
| AOS | Acquisition of Signal |
| AOS | Ago Open Source |
| AOS | Atmospheric And Oceanic Sciences |
| AOSIS | Alliance of Small Island States |
| AOSM | Army of Occupation Service Medal |
| AOSS | Ashtech Office Suite for Survey |
| AOT | Advocate Of Technocracy |
| AOT | Application Object Template |
| AOT | Aerosol Optical Thickness |
| AOT | Adjustment Of Terms |
| AOV | Aspergillus Ochraceus Virus |
| AOY | Any One Year |
| AP | Associated Press |
| AP | Archimedes Plutonium |
| AP | Adhesion Promoter |
| AP | Access Point |
| AP | Adjunct Processor |
| AP | After Parturition |
| AP | Angina Pectoris |
| AP | Acellular Pertussis |
| AP | Agony And Pain |
| AP | Antibiotic Protocol |
| AP | Auscultation and Percussion |
| AP | Addiction Professional |
| AP | Application Processors |
| AP | Application Processor |
| AP | Academic Probation |
| AP | Alternative Power |
| AP | Apical Pulse |
| AP | Additional Problem |
| AP | Apurinic Acid |
| AP | Acid Phosphatase |
| AP | As Purchased |