1. (noun)keynote the principal theme in a speech or literary work Synonyms: tonic
2. (noun)keynote a fundamental or central idea Synonyms: tonic
3. (verb)tonic, keynote (music) the first note of a diatonic scale Synonyms: soda water, tonic water, tonic, soda pop, quinine water, keynote, soda, restorative, pop
4. (verb)keynote set the keynote of
5. (verb)keynote give the keynote address to (an audience)
Synonyms and Antonyms of keynote 
