| Abbreviation | Definition |
|---|---|
| SEM | Search Engine Marketer |
| SEMS | Substitute Employee Management System |
| SENCO | Special Educational Needs Co Ordinator |
| SENCO | Special Educational Needs Coordinator |
| SENCO | Special Educational Needs Co-Ordinator |
| SEO | Senior Executive Officer |
| SEO | Septic Enforcement Officer |
| SEO | State Engineer's Office |
| SEP | Self-Employed Professional |
| SEP | Simplified Employee Pension |
| SEP | Simplified Employee Plan |
| SEP | Surrogate Employer Programme |
| SER | Structural Engineer of Record |
| SERT | Seabee Engineer Reconnaissance Team |
| SERT | Special Education Resource Teacher |
| SET | Senior Engineering Technician |
| SET | Social Engineer Toolkit |
| SEY | Single Enlightened Yogi |
| SF | Supervised Functional |
| SFAD | Supervising Fire Alarm Dispatcher |