| Acronym | Definition |
|---|
| RIFS➣Reflectometric Interference Spectroscopy |
| RIFS➣Remedial Investigation & Feasability Study |
| RIFS➣Reduced Interframe Spacing |
| RIFS➣Rothamsted International Fellowship Scheme (UK) |
| RIFS➣Roland International Freight Services (Los Angeles, CA) |
| RIFS➣Regional Ionospheric Forecast and Specification |