| Abbreviation | Definition |
|---|---|
| MA | Muscle Activity |
| MAAB | Male Assigned At Birth |
| MAC | Macerated |
| MAC | Maximum Allowable Concentration |
| MAC | Monitored Anesthesia Care |
| MAC | Mycobacterium Avium Complex |
| MACEP | Massachusetts Association of Clinical Exercise Physiologist |
| MACEP | Massachusetts College of Emergency Physicians |
| MACI | Matrix-Induced Chondrocyte Implantation |
| MACI | Millon Adolescent Clinical Inventory |
| MACP | Master, American College of Physicians |
| MACR | Master of the American College of Rheumatology |
| MACS | Minimal Access Cranial Suspension |
| MAD | Maximum Adrenaline Dose |
| MAD | Mercury Acquired Disease |
| MAD | Mesenteric Artery Disease |
| MAD | Morning Affective Disorder |
| MAD | Multiple Avatar Disorder |
| MADG | MethylArsenic-DiGlutathione |
| MADRS | Montgomery and Aasberg depression rating scale |