| Abbreviation | Definition |
|---|---|
| AI | aortic incompetence |
| AI | aorto-iliac |
| AI | apical impulse |
| AI | apoptotic index |
| AI | aromatase inhibitor |
| AI | arthritis index |
| AI | association induction |
| AI | asymmetry index |
| AI | atherosclerotic index |
| AI | autoimmune |
| AI | avidity index |
| AI | axio-incisal |
| AI | axonal injury |
| AI | National Institute of Allergy and Infectious Diseases???NIAID |
| AI | National Institute of Allergy and Infectious DiseasesNIAID |
| AI | National Institute of Allergy and Infectious Diseases–NIAID |
| AIA | activation induced apoptosis |
| AIA | antigen-induced arthritis |
| AIA | anti-insulin antibody |
| AIA | aspirin-induced asthma |