Definition of keynote lecture in US English:

keynote lecture

noun

  • A lecture that sets out the central theme of a conference.

    ‘he was giving a keynote lecture at the European Cardiology Congress in Munich’
    • ‘They invited him to give a keynote lecture on the origin of the moon.’
    • ‘The next keynote lecture in the series will be in January.’
    • ‘Food safety issues were addressed in two keynote lectures.’
    • ‘The keynote lecture will be delivered by a world-renowned expert in dinosaur bone microstructure.’
    • ‘Delegates were treated to 14 keynote lectures and 147 oral presentations.’