| Acronym | Definition |
|---|
| EFX➣Effects (as in motion picture special effects; sometimes just FX) |
| EFX➣Effects |
| EFX➣Enhanced Effects |
| EFX➣Elliptical Fitness Crosstrainer |
| EFX➣Elite Force Xtreme (gaming) |
| EFX➣Expeditionary Force Experiment |
| EFX➣Efficient XML |
| EFX➣Expeditionary Force Exercise |
| EFX➣Elite Force Expansion (Star Trek Voyager) |
| EFX➣Emitter File Index |
| EFX➣Electronic Fax Document (file extension) |