| SECD | Calademar, Ecuador 
| Others |
| SECD | Science of Early Child Development
| Others |
| SECD | Seaman Employment Control Division
| Others |
| SECD | Second Expansion Commencement Date
| Others |
| SECD | Sino European Cyber Dialogue
| Others |
| SECD | Social Emotional and Character Development
| Others |
| SECD | Social Emotional Character Development
| Others |
| SECD | Special Education and Communication Disorders
| Others |
| SECD | Stack Environment Code and Dump
| Others |
| SECD | Stack Environment Code Dump
| Others |
| SECD | State Environment Control and Dump
| Others |
| SECD | Stowarzyszenie Edukacji Czlowieka Doroslego
| Others |
| SECD | Strategic Economic and Community Development
| Others |
| SECD | Student and Early Career Development
| Others |
| SECD | Swine Enteric Coronavirus Disease
| Others |
| SECD | Systems Engineering and Computational Design
| Others |