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Definition of keynote:

  1. The fundamental fact or idea; that which gives the key; as, the keynote of a policy or a sermon.
  2. The tonic or first tone of the scale in which a piece or passage is written; the fundamental tone of the chord, to which all the modulations of the piece are referred; - called also key tone.


quinine water, opening, soda pop, important, soda water, tonic water, principal, leading, tonic, official, pop, restorative, soda.

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