| Triennium | triennium |
| Triforium | triforium |
| Tritium | tritium |
| Trivium | trivium |
| Unbiennium | unbiennium |
| Famennium | Famennian |
| Dezennium | decennium |
| Titonium | Tithonian |
| Rhenium | rhenium |
| Patrimonium | patrimony |
| Trickfilm | animated cartoon |
| Triduum | triduum |
| Triefnase | runny nose |
| Trient | Trento |
| Trionfi | major arcana |
| Trinom | trinomial |
| Tritonus | tritone |
| Untriunium | untriunium |
| triefnass | sopping |
| Millennium | millennium |