| second estomac | second stomach |
| Second faux Dimitri | False Dmitry II |
| Second Life | Second Life |
| Second plan | Field |
| Second plat | Second |
| second rôle | bit part |
| Second Souffle | Second Breath |
| Second Temple | Second Temple |
| Second Temple de Jérusalem | Second Temple |
| Second triumvirat | Second Triumvirate |
| Second Vermont Republic | Second Vermont Republic |
| secondaire | insignificant |
| seconde | moment |
| Seconde armée | Second Army |
| Seconde bataille de Bull Run | Second Battle of Bull Run |
| Seconde bataille de Champagne | Second Battle of Champagne |
| Seconde bataille de la Marne | Spring Offensive |
| Seconde bataille de Polotsk | Second Battle of Polotsk |
| Seconde bataille des lacs de Mazurie | Second Battle of the Masurian Lakes |
| Seconde division de la USL | USL Second Division |
| Seconde Fondation | Second Foundation |
| Seconde forme fondamentale | Second fundamental form |
| Seconde Guerre civile soudanaise | Second Sudanese Civil War |
| Seconde guerre de Tchétchénie | Second Chechen War |
| Seconde guerre italo-éthiopienne | Second Italo-Abyssinian War |
| Seconde Guerre mondiale | World War II |
| Seconde Intifada | Second Intifada |
| Seconde mutation consonantique | High German consonant shift |
| seconde nature | second nature |
| Seconde offensive de Rzhev-Sychevka | Second Rzhev-Sychevka Offensive |
| Seconde quantification | Canonical quantization |
| Seconde République espagnole | Second Spanish Republic |
| Seconde révolte serbe | Second Serbian Uprising |
| Seconde école de Vienne | Second Viennese School |
| Seconde-lumière | Light-second |
| seconder | support |
