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English definition of “keynote”

keynote

noun [C]     /ˈkiː.nəʊt/ US  /-noʊt/
the most important or most emphasized part of something: This issue has become the keynote of the election campaign. a keynote address/speech/speaker (= an important talk/speaker at a formal meeting)Important and essential thingsInformation and messages
(Definition of keynote noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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