| Abbreviation | Definition |
|---|---|
| SEDPS | Social Education and Development Society |
| SEE | Small Earnings Exception |
| SEE | Social Environmental And Ethical |
| SEI | Science and Engineering Indicators |
| SEI | Socio Economic Index |
| SEM | Someone Else's Money |
| SEMCFC | SouthEast Michigan Combined Federal Campaign |
| SEMS | Standard Emergency Management System |
| Sen | Senate |
| SEN | Software Engineering Notes |
| SENEL | Single Event Noise Exposure Level |
| SENRAC | Steel Erection Negotiated Rulemaking Advisory Committee (US Department of Labor) |
| SEP | Some Evil Powers |
| SEP | Someone Else's Problem |
| SEP | Special Emphasis Program |
| SEP | Special Executive Protection |
| SERC | Smithsonian Environmental Research Center |
| SERF | Surplus Equipment Recycling Facility |
| SERVE | Secure Electronic Registration And Voting Experiment |
| SES | Social Economic Status |