| Term | Definition |
| terrestrial | earthly; living on land |
| terse | brief; to the point |
| testy | irritable |
| thanatology | the study of death and dying |
| theocracy | government by religious leaders |
| therapeutic | pertaining to the treatment and curing of disease |
| thermal | pertaining to heat |
| thesaurus | a book of synonyms and antonyms; a dictionary |
| thespian | an actor |
| thrall | a slave |
| threnody | a funeral song |
| throes | a violent struggle; pains; agony |
| throng | a crowd |
| thwart | to prevent or hinder |
| timorous | fearful; cowardly |
| tinge | a faint color; a trace |
| tirade | a long angry speech; an outburst of bitter denunciation |
| titanic | huge |
| titillate | to tickle; to excite agreeably |
| titter | to laugh in a self-conscious or nervous way |