Longman Dictionary of Contemporary English homepage

keynote

2 adjective
     
keynote2 [only before noun]
relating to the most important part of a formal meeting, report etc
keynote speech/address/lecture etc
He is scheduled to deliver the keynote address at an awards ceremony.
Bill Gates is booked as the keynote speaker.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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