A speech or talk given at an event during a time when all attendees would be in attendance For example, the Luncheon Keynote would be given during the lunch break when lunch is being provided as part of the event Other typical keynotes are: the Dinner Keynote and the Conference Opening Keynote
a fundamental or central idea the principal theme in a speech or literary work set the keynote of; "Comfort keynotes this designer's Fall collection" give the keynote address to (an audience)
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
The keynote of a policy, speech, or idea is the main theme of it or the part of it that is emphasized the most. He would be setting out his plans for the party in a keynote speech. the main point in a book, system of beliefs, activity etc that influences everything else keynote of. relating to the most important part of a formal meeting, report etc keynote speech/address/lecture etc