| Acronym | Definition |
|---|
| ETR | Estimated Time of Return/Repair |
| ETR | Early to Rise (health e-zine) |
| Etr | Etruscan (linguistics) |
| ETR | Effective Tax Rate |
| ETR | Express Toll Route |
| ETR | Electron Transport Rate (biochemistry) |
| ETR | Evaluation Team Report (Ohio educational system) |
| ETR | Eastern Test Range |
| ETR | Electronic Toll Road |
| ETR | Ecological Tax Reform |
| ETR | Early Token Release (FDDI) |
| ETR | Engineering Test Reactor |
| ETR | Employer Trip Reduction (commuting cost cut) |
| ETR | Essex Terminal Railway |
| ETR | Enjoy the Ride (travel agency) |
| ETR | Estimated Time of Restoration |
| ETR | Electronically Tuned Receiver |
| ETR | Easy-To-Reach (ITU-T) |
| ETR | Export Traffic Release |
| ETR | Electronic Tax Register |
| ETR | Employment & Training Resources |
| ETR | External Timer Reference |
| ETR | Estimated Time Remaining |
| ETR | Electronic Target Range (UK) |
| ETR | Evaporator Temperature Regulator (air conditioning) |
| ETR | Experimental Test Reactor |
| ETR | Existing to Remain (architectural/design) |
| ETR | Energy Transfer Ratio |
| ETR | Engine Transaction Report |
| ETR | Embedded Training Requirements |
| ETR | Estimated Total Return |
| ETR | External Transfer Rate (Seagate) |
| ETR | Expanded Test Report |
| ETR | Engineering Technical Review |
| ETR | Expected to Realize |
| ETR | Energie-Transport-Reaktionsmodell (German: Energy Transport Reaction model) |
| ETR | Extra Testing Rule (reliability testing) |
| ETR | Extended Target Region |
| ETR | Energy Trading & Risk |
| ETR | Engineering Test Requirements |
| ETR | Equipamento Terminal de Rede (Portuguese) |
| ETR | End of Tour Report |
| ETR | Enhanced Toll Restriction (Teltronics Vision PBX) |
| ETR | Electronically Transmitted Return (US IRS) |
| ETR | Electronic Time Recorder (clock) |
| ETR | Education, Training and Research (California) |
| ETR | Events to Remember (various locations) |
| etr | Educator's Travel Resource |