| Abbreviation | Definition |
|---|---|
| AIS | Artificial Immune System |
| AIT | Acute Intensive Treatment |
| AIT | Auditory Integration Therapy |
| AITD | Auto-Immune Thyroid Disease |
| AIVR | Accelerated Idioventricular Rhythm |
| AIVR | Accelerated Idio-Ventricular Rhythm |
| AJ | Ankle Jerk |
| AK | Above the Knee |
| AK | Acne Keloidalis |
| AK | Actinic Keratosis |
| AK | Alternaria Kikuchiana |
| AK | Anterior Kidney |
| AK | Astigmatic Keratotomy |
| AKA | Above-the-Knee Amputation |
| AKA | Alcoholic KetoAcidosis |
| AKI | Acute Kidney Injury |
| AL | Accessory Ligament |
| AL | Active Lipid |
| AL | Anterior Lateral |
| AL | Auris Left (left ear) |