Meaning of the word keynote in English

What does keynote mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

keynote

US /ˈkiː.noʊt/
UK /ˈkiː.nəʊt/

Noun

the main idea or theme of a speech, book, or event

Example:
The CEO's keynote address focused on innovation and future growth.
The conference began with a powerful keynote from a renowned scientist.