| trial and error | tâtonnements |
| trial balloon | ballon d'essai |
| Trial division | Divisions successives |
| Trial of the Sixteen | Procès des seize |
| trial period | stage |
| trials and tribulations | tribulations |
| triangle | triangle |
| Triangle choke | Triangle |
| triangle inequality | inégalité triangulaire |
| triangular | triangulaire |
| Triangular cupola | Coupole triangulaire |
| Triangular dipyramid | Diamant triangulaire |
| Triangular orthobicupola | Orthobicoupole triangulaire |
| triangular prism | prisme triangulaire |
| Triangular trade | Commerce triangulaire |
| triangulation | triangulation |
| Triangulum | Triangle |
| Triangulum Australe | Triangle austral |
| Triangulum Galaxy | galaxie du Triangle |
| Triarii | Triarii |
| Triassic | Trias |
| Triassic-Jurassic extinction event | Extinction du Trias-Jurassique |
| triathlon | triathlon |
| Triathlon at the Summer Olympics | Triathlon aux jeux Olympiques |
| Triatoma infestans | Vinchuca |
| Triatoma protracta | Triatoma protracta |
| Triaugmented dodecahedron | Dodécaèdre triaugmenté |
| Triaugmented hexagonal prism | Prisme hexagonal triaugmenté |
| Triaugmented triangular prism | Prisme triangulaire triaugmenté |
| tribadism | tribadisme |
| tribal | tribal |
| Tribal Wars | TribalWars |
| tribalism | tribalisme |
| Tribble | Tribble |
| tribe | tribu |
| Tribe of Benjamin | Tribu de Benjamin |
| Tribe of Dan | Tribu de Dan |
| Tribe of Gad | Tribu de Gad |
| Tribe of Joseph | Tribu de Joseph |
| Tribe of Judah | Tribu de Juda |
| Tribe of Manasseh | Tribu de Manassé |
| Tribe of Naphtali | Tribu de Nephthali |
| Tribe of Reuben | Tribu de Ruben |
