| Abbreviation | Definition |
|---|---|
| AGA | Association of Government Accounts |
| AGD | action goal date |
| AGRICOLA | AGRICultural On-Line Access |
| AHA | American Hospital Association |
| AHF | antihemophilic factor |
| AHF | Anti-Hemophilic Factor |
| AHFS | American Hospital Formulary Service |
| AHI | Animal Health Institute |
| AHIC | American Health Information Community |
| AI | Additional Information Letter |
| AICRC | Association of Independent Clinical Research Contractors |
| AIIS | Analogous Industrial Injuries Scheme |
| AIM | Active Ingredient Manufacturer |
| AIMBE | American Institute for Medical and Biological Engineering |
| AIMDD | Active Implantable Medical Device Directive |
| AIMS | Agency Information Management System |
| AIN | Additive Identification Number for food additives |
| AIN | food additive identification number (ORA AofC code) |
| AIP | APHIS (Animal and Plant Health Inspection Service) Integrated Planning |
| AIP | Application Integrity Policy |