| E-OK | electronically OK | The web site http://www.e-okkids.com claims to have registered this trademark as "environmentally and ecologically good" (EEG?), so don't blame us if you are attacked by three talking dinosaurs if you use it improperly... |
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| EBG | electronic bandgap | A form of meta-material. |
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| ECAD | Electronic CAD | Tools used by designers (as opposed to TCAD, used by technology developers) |
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| ECL | emitter coupled logic | -- |
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| ECM | electronic countermeasures | Also ECCM for counter-counter measures. |
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| ED | electro-deposition | In this context, placing metal through the use of electrolysis (not something you take Viagra for). |
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| EDA | Electronic design automation | The new term for "CAD" |
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| EDM | electronic discharge machining | A way to make very accurate metal parts. |
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| EER | envelope elimination and restoration | A supply modulation technique for improving efficiency. |
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| EHF | extra-high frequency | -- |
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| EIA | electronics industry association | A trade association that represents all areas of the electronics industry. |
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| EIC | Electronics Industries Alliance | A trade association that represents all areas of the electronics industry. |
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| EIKA | Extended interaction klystron amplifier | A microwave tube that can provide 1000 watts at millimeterwave frequencies. |
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| EIRP | effective isotropic radiated power | -- |
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| EM | electromagnetic | What Maxwell figured out. |
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| EMC | electromagnetic compatibility | -- |
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| EMI | electromagnetic interference | What you get if you don't pay attention to EMC requirements. |
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| EMP | electromagnetic pulse | The reason your car won't run during a nuclear attack on your neighborhood. |
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| ENR | excess noise ratio | A rating for noise sources. |
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| ERP | effective radiated power | -- |
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| ESA | electronically-steered array | Similar to AESA, without all the amplifiers at each phase center. |
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| ESD | electrostatic discharge | Phantom force that blows up hardware if you don't wear a strap. |
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| ESL | electronic system level | Refers to software environments for system analysis. |
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| ESR | equivalent series resistance | The resistive loss of a capacitor. |
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| ESS | environmental stress screening | -- |
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| ET | envelope tracking | A supply modulation technique for improving efficiency. |
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| ETC | electronic toll-collecting | -- |
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| ETSI | European Telecommunications Standards Institute | -- |
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| EUT | end user terminal | -- |
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| EVM | error vector magnitude | -- |
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| EW | electronic warfare | -- |
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