| Abbreviation | Definition |
|---|---|
| SEIL | Samsung Electronics India Limited |
| SEIL | Scotland Electronics International Ltd |
| SEIM | Software Engineering Improvement Method |
| SEIP | Sumitomo Electric Interconnect Products |
| SEL | Selve Electronic Luxury |
| SEL | Standard Electric Lorenz |
| SEL | Surface-Emitting Laser |
| SELM | Simulated Electronic Launch Minuteman |
| SELV | Safe Extra Low Voltage |
| SELV | Separated Extra Low Voltage |
| SEM | Synthesizer Expander Module |
| SEMA | Segmented Electro Magnetic Array |
| SEMAP | Salem Electric Member Assistance Program (Salem, OR) |
| SEMI | Semiconductor |
| SEMISPIN | Semiconductor Software Process Improvement Network |
| SEMS | Scanning Electrical Mobility Spectrometer |
| SEN | Straight Electrode Negative |
| SEP | Software Engineering Process |
| SEPA | Solar Electric Power Association |
| SEPB | Scottsboro Electric Power Board |