| Abbreviation | Definition |
|---|---|
| SDC | Spot Deferred Contracts |
| SDCT | NIST Software Diagnostics and Conformance Testing Division |
| SDD | Software Design Description |
| SDDS | Special Data Dissemination Standards |
| SDF | Statutory Declaration Form |
| SDM | Shared Decision Making |
| SDP | Security Democracy Prosperity |
| SDP | Strategic Development Plan |
| SDQ | Strategic Directions Questionnaire |
| SDR | Statistical Discrepancy Reported |
| SDRS | Supplier Document Requirement Specification |
| SDS | State Disposal System |
| SE | Systematic Error |
| SEA | Self Evident Application |
| SEA | Strategic Environmental Assessment |
| SEAL | Sulcal Extraction And Labelling |
| SEATO | South East Asia Treaty Organization |
| SEC | Securities and Exchange Commission |
| SEC | Space Environment Center |
| SEDAC | Socioeconomic Data and Applications Center |