| Abbreviation | Definition |
|---|---|
| PORA | Preliminary Order for Reinforced Alert |
| PORACC | Principles Of Radiation And Contamination Control |
| PORCN | Production Order Records Change Notice |
| PORDA | Personnel Officers of Research and Development Agencies |
| PORES | Purchase Order REceiving System |
| PORI | Partial Operational Readiness Instrumentation |
| PORN | Petty Officer Royal Navy |
| PORR | Purchase Order Revision Request |
| PORTAPAC | Portable Self-contained Instrument PACkage |
| PORTAPOTTY | Temporary Toilet |
| PORTREP | Port Capacity Report |
| PORTS | Physical Oceanographic Real Time System |
| PORTS | Port Characteristics File |
| PORTS | Portable Remote Telecommunications System |
| PORTSIM | Port Simulation Model |
| POS | Peacetime Operating Stocks |
| POS | Peacetime Operational State |
| POS | perceived organizational support |
| POS | Piece Of Shit |
| POS | Point of Separation |