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1a medicinal substance taken to give a feeling of vigor or well-being. something with an invigorating effect:being needed is a tonic for someone at my age 3 Music the first note in a scale that, in conventional harmony, provides the keynote of a piece of music.
1giving a feeling of vigor or well-being; invigorating. 2 Music relating to or denoting the first degree of a scale. 3 Phonetics denoting or relating to the syllable within a tone group that has greatest prominence, because it carries the main change of pitch. 4relating to or restoring normal tone to muscles or other organs. Physiology relating to, denoting, or producing continuous muscular contraction.