| Acronym | Definition |
|---|
| PIFS➣Pacific Islands Forum Secretariat |
| PIFS➣Point Inter Frame Space |
| PIFS➣Philippine International Furniture Show |
| PIFS➣Post-Infectious Fatigue Syndrome |
| PIFS➣Program on International Financial Systems (Harvard Law School; Cambridge, MA) |
| PIFS➣Priority Interframe Spacing |
| PIFS➣Prolonged Intermittent Foot Shock (clinical psychological research) |