| Tritonus | tritone |
| Triton | Triton |
| Trikont | Third World |
| Trionfi | major arcana |
| trigonal | trigonal |
| Tribus | tribe |
| Tripolis | Tripoli |
| Tritium | tritium |
| Ritus | rite |
| Titonium | Tithonian |
| Tonus | tone tension tonicity tonus whole ton |
| Eridanus | Eridanus |
| Tetanus | tetanus |
| Trialis | trial |
| Tribock | trebuchet |
| Tribok | trebuchet |
| Tribune | tribune |
| Tribüne | stand |
| Tricks | hanky-panky |
| Triduum | triduum |