| Abbreviation | Definition |
|---|---|
| P&T | professional and technical |
| P1casualty | Priority 1 casualty |
| P2casualty | Priority 2 casualty |
| P3casualty | Priority 3 casualty |
| PA | Palaeopathology Association |
| PA | palladium |
| PA | paranoia |
| PA | Parapsychological Association |
| PA | pathology |
| PA | patient |
| PA | patients association |
| PA | patients’ association |
| PA | percussion & auscultation |
| PA | performance analysis |
| PA | periarteritis |
| PA | periodic acid |
| PA | pernicious anaemia |
| PA | phosphoric acid |
| PA | photoallergic |
| PA | physician advisor |