| Term | Definition / Meaning / Stand for |
| E |
East |
| E |
Eccentric Anomaly |
| E |
Eccentricity |
| E |
Echelle Spectrograph |
| E |
Eclipse |
| E |
Ecliptic |
| E |
Eddington Limit |
| E |
Eddington Luminosity |
| E |
Effective Temperature |
| E |
Einstein Coefficient |
| E |
Einstein Ring |
| E |
Einstein |
| E |
Electric Field |
| E |
Electromagnetic Spectrum |
| E |
Electromagnetic |
| E |
Electron Degeneracy Pressure |
| E |
Electron |
| E |
Electroweak |
| E |
Elliptical Galaxy |
| E |
Ellipticity |
| E |
Emission Line |
| E |
Emission Measure |
| E |
Emission Nebula |
| E |
Emission |
| E |
Empirical |
| E |
Endothermic |
| E |
Energy Density |
| E |
Energy Flux |
| E |
Energy |
| E |
Enthalpy |
| E |
Entropy |
| E |
Ephemeris |
| E |
Epoch |
| E |
Epsilon |
| E |
Equator |
| E |
Equatorial Mount |
| E |
Equatorial |
| E |
Equilibrium |
| E |
Equinox |
| E |
Erg |
| E |
Ergosphere |
| E |
Escape Fraction |
| E |
Escape Time |
| E |
Escape Velocity |
| E |
Escape |
| E |
Eutectic |
| E |
Evaporation |
| E |
Event Horizon |
| E |
Event |
| E |
Evolved Star |
| E |
Excitation |
| E |
Exclusion Principle |
| E |
Exit Cone |
| E |
Exoplanet |
| E |
Exosphere |
| E |
Exothermic |
| E |
Expansion |
| E |
Exponential |
| E |
Extensive |
| E |
Extinction Coefficient |
| E |
Extragalactic |
| E |
Extraterrestrial |
| E |
Extreme Ultraviolet |
| E |
Eyepiece |
| ESMC |
Air Force Eastern Space And Missile Center |
| EXTRAJ |
Ascent Trajectory |
| ELN |
Digital Equipment Corporation's Real-Time Operating Sn |
| EACE |
Early Analysis Capability Enhanced |
| E |
Earth |
| ELE |
Earth Limb Experiment |