| Abbreviation | Definition |
|---|---|
| ET | Extra Tanked |
| ET | Extra Terrestrial |
| ETA | Engine Temperature Alarm |
| ETA | Estimated Time of Arrival |
| ETA- | Estimated Time Arrival |
| ETAC | Emergency Tactical Air Control |
| ETAS | Elevated Target Acquisition System |
| ETC | Electrothermal Chemical |
| ETC | Enhanced Tactical Computer |
| ETC | Enhanced Terminal Capability |
| ETD | Electronic Transfer Device |
| ETD | Estimated Time of Departure |
| ETDL | Electronic Technology and Devices Laboratory |
| ETE | End-To-End |
| ETF | Electronic Target Folder |
| ETF | Electronic Test Facility |
| ETF | Engineering Test Facility |
| ETG | European Theatre Group |
| ETI | Estimated Time of Intercept |
| ETIBS | Enhanced TIBS |