| Abbreviation | Definition |
|---|---|
| SA | Simple-Adjoint |
| SA | Spaced Antenna |
| SA | Supplied Air |
| SAA | Satellite Active Archive |
| SABRE | South Atlantic Bight Recruitment Experiment |
| SAC | Seismic Analysis Code |
| SAC | Special Analysis Center |
| SACZ | South Atlantic Convergence Zone |
| SAFER | Spectral Application of Finite Element Representation |
| SAFISY | Space Agency Forum for the International Space Year |
| SAGA | Soviet- American Gas and Aerosol Agreement |
| SAGA | Soviet-American Gas and Aerosol Agreement |
| SAGA-3 | Third Soviet- American Gas and Aerosol Agreement |
| SAGA-3 | Third Soviet-American Gas and Aerosol Agreement |
| SAGE | Stratospheric Aerosol and Gas Experiment |
| SAIDI | Spaced Antenna Imaging Doppler Interferometer |
| SAKS | Southern African Killifish Society |
| SAMW | Sub- Antarctic Mode Water |
| SAMW | Subantarctic Mode Water |
| SANA | SANierung der Atmosph #228 |