| siglário | acronictionary |
| sigma | sigma |
| Sigma Hydrae | Sigma Hydrae |
| Sigma Octantis | Sigma Octantis |
| Sigma Olomouc | SK Sigma Olomouc |
| Sigma-álgebra | Sigma-algebra |
| Sigmaringen | Sigmaringen |
| Sigmund Freud | Sigmund Freud |
| Sigmund Jähn | Sigmund Jähn |
| Sign of the Hammer | Sign of the Hammer |
| Signal Iduna Park | Signal Iduna Park |
| signatária | signatory |
| signatário | subscriber |
| Signe Toly Anderson | Signe Toly Anderson |
| significa | means |
| significado | sense |
| significado descritivo | to import |
| significado implícito | undertone |
| significado oculto | to import |
| significante | significant |
| significar | mean |
| significativamente | significantly |
| significativo | significant |
| significação | significance |
| significância | significance |
| signifique | signify |
| signo zodiacal | sign of the Zodiac |
| Signos zodiacais | Astrological sign |
| Signs of Chaos | Signs of Chaos |
| Signy-Avenex | Signy-Avenex |
| Sigourney Weaver | Sigourney Weaver |
| Sigrid Undset | Sigrid Undset |
| Sigriswil | Sigriswil |
| SIGTERM | SIGTERM |
| Sigur Rós | Sigur Rós |
| Sigurd | Sigurd |
| Sigurd Haakonsson | Sigurd Haakonsson |
| Sigurd I da Noruega | Sigurd I of Norway |
| Sigurd Wongraven | Sigurd Wongraven |
| Sigurjón Birgir Sigurðsson | Sjón |
| Sihuas | Sihuas |
| Siilitie | Siilitie metro station |
| Sikasso | Sikasso Region |
| sikh | Sikh |
| sikhismo | Sikhism |
| Sikkim | Sikkim |
| SikTh | SikTh |
| SIL International | SIL International |
| silabário | syllabary |
| silagem | ensilage |
| Silandro | Schlanders |
| silano | silane |
| Silap Inua | Silap Inua |
| Silat | Silat |
| Silberhausen | Silberhausen |
| silenciador | muffler |
| silenciar-se | remain silent |
| silenciara | to silence |
| silenciosamente | quietly |
| silencioso | still |
