| Airborne Data Acquisition System | Academic & Science |
| AWOS/ASOS Data Acquisition System | Academic & Science |
| Asiago DLR Asteroid Survey | Academic & Science |
| Alcohol and Drug Abuse Studies | Academic & Science |
| Architecture Design and Assessment System | Academic & Science |
| Advanced Driver Assistance System | Business |
| Annual Diagnosis Arthritis Symposium | Community |
| Association des Doctorants et Assistants en Sciences | Community |
| Automated Disk Analysis System | Computing |
| Automated Directory Assistance System | Computing |
| Automatic Data Acquisition System | Computing |
| Advanced Directory Assistance System | Computing |
| Agricultural Development and Advisory Service | General |
| Advanced Driver Assistance Systems | General |
| Atomic Data and Analysis Structure | General |
| Advanced Driver Assist Systems | General |
| Advanced Driver Awareness System | General |
| Adaptive Driving Assistance System | General |
| Autonomous Driver Assisted System | General |
| Advanced Driver Assistance Solutions | General |
| AWOS Data Acquisition System | Governmental |
| Agricultural Development Advisory Service | Medical |
| Alzheimer's Disease Assessment Scale | Medical |
| Assistant Director of The Army Staff | Military and Defence |
| Airborne Data Automation System | Military and Defence |
| Army Designated Acquisition System | Military and Defence |
| Aircraft Design and Analysis System | Military and Defence |
| Australian Diver Acceditation Scheme | Regional |
| Australian Diver Accreditation Scheme | Regional |
| Arps Data Analysis System | Softwares |
