| Abbreviation | Definition |
|---|---|
| EFMS | Electronic Fuel Management Systems |
| EFNS | Electronic Foreign Nationals Services |
| EFO | Electronic Flame Off |
| EFO | Electronic Flame-Off |
| EFOCS | Evanescent Fiber Optic Chemical Sensor |
| EFOI | electronic Freedom of Information |
| EFP | Electronic Fuel Pump |
| EFP | Electronic Fuel PumpExplosively |
| EFPP | Electronic Fiscal Pump Printer |
| EFPS | Electronic Filing and Payment System |
| EFPS | Electronic Flight Progress Strip |
| EFPS | Electronic Flight Progress System |
| EFR | Early Failure Rate |
| EFR | Electric Fixed Ratio |
| EFR | Electronic File Room |
| EFR | Enhanced Failure Rate |
| EFRD | electronic Facilities Requirements Data |
| EFRF | Enhanced Frequency Response Function |
| EFRF | Equipment Failure Report Form |
| EFRS | Electrical Fault Restriction System |