| Abbreviation | Definition |
|---|---|
| ERA | Electrical Replaceable Assembly |
| ERA | Environmental Research Aircraft |
| ERA | Exabiology and Radiation Assembly |
| ERAP | Earth Resources Aircraft Program |
| ERAST | Environmental Research Aircraft and Sensor Technology |
| ERBE | Earth Radiation Budget Experiment |
| ERBE-NS | Earth Radiation Budget Experiment Non-Scanner |
| ERBE-S | Earth Radiation Budget Experiment Scanner |
| ERBS | Earth Radiation Budget Satellite |
| ERC | Event ReCorder |
| ERCA | Electrochemically Regenerable CO2 Absorber |
| ERD | Experiment Requirements Document |
| EREP | Earth Resources Package |
| ERG | ERGometer |
| ERIP | Experiment Requirement and Implementation Plan |
| ERJ | Embraer Regional Jet |
| ERL | Environmental Research Laboratory |
| ERL | Equipment Return Loss |
| ERNE | Energetic and Relativistic Nuclei and Electron Experiment |
| ERNO | Entwicklungts Ring NOrd (‘Northern Development Ring’, Space Division of European Consortium) |