What is the meaning of Tonic?

Pertaining to tension, especially of muscles.

Restorative, curative or invigorating.

In a state of continuous unremitting action.

A substance with medicinal properties intended to restore or invigorate.

Tonic water.

Any of various carbonated, non-alcoholic beverages; soda pop.

Someone or something that revitalises or reinvigorates.

To restore or invigorate.

Pertaining to or based upon the first note of a diatonic scale.

Pertaining to the accent or stress in a word or in speech.

Of or relating to tones or sounds; specifically being or relating to a speech sound made with tone unmixed and undimmed by obstruction, i.e. a vowel or diphthong.

The first note of a diatonic scale; the keynote.

The triad built on the tonic note.

A tonic element or letter; a vowel or a diphthong.

drink made up mainly of cinchona

tonic water

tonic

Source: wiktionary.org