| Abbreviation | Definition |
|---|---|
| ESYNCSECURITY | electronic synchronization and Security |
| ET | Electronic Technician |
| ET | Electronic Terrain |
| ET | Electronic Torture |
| ET | Encryption Technology |
| ETA | Electronic Travel Aids |
| ETA | Electronics Transaction Association |
| ETAB | Executive Technical Advisory Board |
| ETAC | Electric Technical Advisory Committee |
| ETACS | Electronic Time Alarm Control System |
| ETACS | Electronic Time And Alarm Control System |
| ETACS | Electronic Time and Control System |
| ETACS | Electronic Timing Alarm Control System |
| ETAD | Electronic Time Attendance Document |
| ETAF | electronic Talk Among Friends |
| ETAP | Electrical Transient Analysis Program |
| ETAP | Electrical Transient Analyzer Program |
| ETAP | Electrical Transient and Analysis Program |
| ETAPS | Electronic Title Application Processing System |
| ETAS | Electronic Travel Authority System |