Tonic: Definition, Musical Meaning & Health Benefits

Tonic has distinct meanings across domains:

  1. Music (adj/noun): The first degree of a scale; the keynote. A tonic chord provides resolution. (Adj) Relating to the tonic.
  2. Medicine/health (noun): A substance that invigorates or restores health (e.g., herbal tonic). Also, tonic water – carbonated water with quinine.
  3. Physiology (adj): Relating to continuous muscle tone (tonic contraction) vs. phasic.
  4. Linguistics (adj/noun): The syllable carrying primary stress; a tonic vowel/syllable.

Context determines the correct sense.

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