| thalmencephalon | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, diencephalon, interbrain |
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| threepence | (noun) former cupronickel coin of the United Kingdom equal to three pennies | - |
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| totipotence | (noun) the ability of a cell to give rise to unlike cells and so to develop a new organism or part | Synonyms: totipotency |
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| transcendence | (noun) a state of being or existence above and beyond the limits of material experience | Synonyms: transcendency |
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| (noun) the state of excelling or surpassing or going beyond usual limits | Synonyms: superiority, transcendency |
| transference | (noun) transferring ownership | Synonyms: transfer |
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| (noun) the act of transferring something from one form to another | Synonyms: transfer |
| (noun) (psychoanalysis) the process whereby emotions are passed on or displaced from one person to another; during psychoanalysis the displacement of feelings toward others (usually the parents) is onto the analyst | - |
| transience | (noun) an impermanence that suggests the inevitability of ending or dying | Synonyms: transiency, transitoriness |
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| (noun) the attribute of being brief or fleeting | Synonyms: brevity, briefness |
| translucence | (noun) the quality of allowing light to pass diffusely | Synonyms: semitransparency, translucency |
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| transparence | (noun) the quality of being clear and transparent | Synonyms: transparency, transparentness |
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| (noun) permitting the free passage of electromagnetic radiation | Synonyms: transparency |
| truculence | (noun) obstreperous and defiant aggressiveness | Synonyms: truculency |
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| tumescence | (noun) tumidity resulting from the presence of blood or other fluid in the tissues | - |
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| tuppence | (noun) a former United Kingdom silver coin; United Kingdom bronze decimal coin worth two pennies | Synonyms: twopence |
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| turbulence | (noun) unstable flow of a liquid or gas | Synonyms: turbulency |
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| (noun) a state of violent disturbance and disorder (as in politics or social conditions generally) | Synonyms: Sturm und Drang, upheaval |
| (noun) instability in the atmosphere | - |
| twopence | (noun) a former United Kingdom silver coin; United Kingdom bronze decimal coin worth two pennies | Synonyms: tuppence |
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| valence | (noun) (chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent) | Synonyms: valency |
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| (noun) (biology) a relative capacity to unite or react or interact as with antigens or a biological substrate | Synonyms: valency |
| vehemence | (noun) the property of being wild or turbulent | Synonyms: ferocity, fierceness, furiousness, fury, violence, wildness |
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| (noun) intensity or forcefulness of expression | Synonyms: emphasis |
| violence | (noun) an act of aggression (as one against a person who resists) | Synonyms: force |
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| (noun) the property of being wild or turbulent | Synonyms: ferocity, fierceness, furiousness, fury, vehemence, wildness |
| (noun) a turbulent state resulting in injuries and destruction etc. | - |
| virulence | (noun) extreme harmfulness (as the capacity of a microorganism to cause disease) | Synonyms: virulency |
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| (noun) extreme hostility | Synonyms: virulency |