| Abbreviation | Definition |
|---|---|
| ROLA | Rest Of Latin America |
| RT | Recueillis Temporaires |
| Rx | recipere |
| S&V | Sepientia et Veritas |
| SAEPISS | Saepissime |
| SALAS | Student Association for Latin American Studies |
| SB | Sanctus Blasius |
| SC | Senatus Consulto |
| SCHP | Scholarum Piarum (Roman Catholic religious order) |
| scil. | Latin abbreviation, legal term used in business letter |
| scil. | scilicet (means literally "one may know") |
| SCV | Sodalitium Christianae Vitae |
| SD | Sine Datum |
| SDG | Soli Deo Gloria |
| SILAS | Society for Irish Latin American Studies |
| SIP | Semper In Primis |
| SJT | Scientiae Juridicae Doctor |
| SL | Sine Loco |
| SLB | Start Latin Boundary |
| SN | Sine Nomine |