| Abbreviation | Definition |
|---|---|
| ET | Educational Technologies |
| ET | EsoTropia |
| ET | Equal Temperament |
| ET | Evapo Transpiration |
| ET | Enterostomal Therapy |
| ET | Extra Testicular |
| ET | Ecological Transport |
| ET | Educational Trainer |
| ET | Executive Technical |
| ET | Early Termination |
| ET | Enterostomal Therapist |
| ET | Executive Team |
| ET | Endotracheal Tube |
| ET | Code of Professional Conduct |
| ET | Employment Tax |
| ET | Earning Threshold |
| ETA | estimated time of arrival |
| ETA | Estimated Time of Arrival |
| ETA | English Teaching Assistant |
| ETA | Empty Tank Alert |
| ETA | Engine Temperature Alarm |
| ETA | Environmental Test Article |
| ETA | Estimated Time to Acquisition |
| ETA | Explosive Transfer Assembly |
| ETA | External Tank Attachment |
| ETA | Enquiry Taxpayer Amendment |
| ETA | Engelbert Tristram Award |
| ETA | English Translation Award |
| ETA | Expected Time of Arrival |
| ETA | Edited To Add |
| ETA | Electronic Travel Authority |
| ETA | Energy Transfer Accelerance |
| ETA | Employee Training Assessment |
| ETA | Explore Think Act |
| ETA | Electric Trainer Aircraft |
| ETA | Electronic Transfer Account |
| ETAP | Enroute Traffic Analysis Program |
| ETB | Equipment Transfer Bag |
| ETBYLAW | Bylaws of the American Institute of Certified Public Accountants |
| etc | et cetera (other things) |
| ETC | Executive Transaction Coordinators |
| ETC | Experiment Test Cycle |
| ETC | Earth Terrain Camera |
| ETCO2 | End tidal carbon dioxide |
| ETD | Elevated Temperature Drawn |
| ETD | Electrical Terminal Distributor |
| ETE | Estimated Time En Route |
| ETEC | Enterotoxigenic Escherichia Coli |
| ETF | Energy, Time, Frequency |
| ETF | Eustachian Tube Function |