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Definition of tonic
tonic - adj. used of syllables; relating to or being the keynote of a major or minor scale; employing variations in pitch to distinguish meanings of otherwise similar words; of or relating to or producing normal tone or tonus in muscles or tissue; imparting vitality and energy; noun a medicine that strengthens and invigorates; (music) the first note of a diatonic scale; lime- or lemon-flavored carbonated water containing quinine; a sweet drink containing carbonated water and flavoring.
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