| Abbreviation | Definition |
|---|---|
| P | Phi |
| P | Prima |
| P/S | Post Scriptum |
| PAX | Peace |
| PC | Patres Conscripti |
| PC | Prontor Compur |
| PERCENT | Per Centum |
| PF | Publii Filius |
| PG | Patrologia Graecae |
| PH | Potentia Hydrogenii |
| PILA | Princeton in Latin America |
| PIT | Per Iter Tenebricosum |
| PLAC | Parents of Latin American Children |
| PLAC | Penn in Latin America the Caribbean |
| PLAS | Program in Latin American Studies |
| PLEBS | Plebeians; One of middle or lower class. |
| PM | Post Meridiem |
| PM | Pro Memoria |
| PO | Per Os (Latin: by mouth, orally) |
| PP | Pater Patriae |