| Science Education Department, Harvard-Smithsonian Center for Astrophysics | Academic & Science |
| Society for Economic Dynamics | Academic & Science |
| Secure Electronic Delivery | Academic & Science |
| Science Entertainment and Design | Academic & Science |
| Systems Engineering Division | Academic & Science |
| Structured Electronic Data | Academic & Science |
| Statistical Engineering Division | Academic & Science |
| Sedom | Airport Code |
| Svetlana Electronic Devices | Business |
| Special Excise Duty | Business |
| Saltus Euro (De-listed) | Business |
| Shipper's Export Declaration | Business |
| Small End Diameter | Business |
| State Education Department | Community |
| Socio Economic Development | Community |
| Sex Education Drugs | Community |
| Spanish Education Development | Community |
| Solar Electric Development | Community |
| Sales Engineering and Development | Community |
| Severely Emotionally Disturbed | Community |
| Self Evaluation Document | Community |
| Secure Encryption Device | Computer Hardware |
| Surface-conduction Electron-emitter Display | Computer Hardware |
| Stream EDitor | Computing |
| Software Engineering Division | Computing |
| Self Extracting Directive | Computing |
| Self Encrypting Disk | Computing |
| Single Error Detection | Computing |
| Search Engine De-Optimization | Computing |
| Search Engine Dysfunction | Computing |
| Search Engine Domination | Computing |
| Symbolic Execution Debugger | Computing |
| Site Equipment Demonstration | Electronics |
| Smoke Emitting Diode | Electronics |
| Smith Edwards Dunlap | General |
| Self Encrypting Drive | General |
| Sozialistische Einheitspartei Deutschlands | General |
| Survey of Earned Doctorates | General |
| Scroll Enclosed Duplex | General |
| Sensory Environment Design | General |
| Social Elderly Designers | General |
| Serious Emotional Disturbances | General |
| Said Enough Darling | General |
| Structured Expert Dialogue | General |
| S Export Declaration | General |
| Symmetric Eigenvalue Decomposition | General |
| Shared Experience Display | General |
| Kia Sedona | General |
| Solvent Emissions Directive | Governmental |
| Sustainable Energy Development | Governmental |
| Spectral Energy Distribution | Governmental |
| Special Enforcement Detail | Governmental |
| Safety and Enforcement Division | Governmental |
| Shipper's Export Document | Governmental |
| Special Enforcement Division | Governmental |
| Seriously Emotionally Disturbed | Governmental |
| Severe Emotional Disturbance | Governmental |
| Sozialistischen Einheitspartei Deutschlands | Governmental |
| SHEDBAL | Indian Railway Station |
| Search Engine Database | Internet |
| Standard Erythema Dose | Medical |
| Serious Emotional Disability | Medical |
| Serious Emotional Disturbance | Medical |
| Sweet Eagle Dreams | Messaging |
| Software Engineering Directorate | Military and Defence |
| Software Engineering Design | Military and Defence |
| Signals External Data | Military and Defence |
| Sedom, Israel | Regional |
| Scottish Education Department | Regional |
| Stream Editor Disk | Softwares |
| Space Exploration Day | Space Science |
