| tonic | (adjective) (used of syllables) bearing the principle stress, usually accompanied by a change in pitch | Synonyms: accented |
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| (adjective) employing variations in pitch to distinguish meanings of otherwise similar words | Synonyms: tonal |
| (adjective) of or relating to or producing normal tone or tonus in muscles or tissue | - |
| (adjective) imparting vitality and energy | Synonyms: bracing, brisk, fresh, refreshful, refreshing |
| (adjective) relating to or being the keynote of a major or minor scale | - |
| (noun) a medicine that strengthens and invigorates | Synonyms: restorative |
| (noun) (music) the first note of a diatonic scale | Synonyms: keynote |
| (noun) a sweet drink containing carbonated water and flavoring | Synonyms: pop, soda, soda pop, soda water |
| (noun) lime- or lemon-flavored carbonated water containing quinine | Synonyms: quinine water, tonic water |
| tonicity | (noun) the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli | Synonyms: tone, tonus |
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| tonight | (noun) the present or immediately coming night | - |
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| (adverb) during the night of the present day | Synonyms: this evening, this night |