| tonic | (noun) a medicine that strengthens and invigorates | Synonyms: restorative |
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| (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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