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A keynote is the main, most important speech at a conference or big event — usually given first, to set the tone for everything that follows. The person who gives it is the 'keynote speaker.' The word comes from music, where the keynote (or 'key note') is the main note that a whole piece of music is built around — everything else fits with it.
主題演講（會議中最重要的演講）
組成key (the main, most important one) + note (a single musical sound) — the note that everything else in the music is built around.
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
keynotenoun/ˈkiːˌnoʊt/
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A speech that sets the main theme of a conference or other gathering; a keynote speech or keynote address.
- keynote speech
- keynote speaker
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The main theme of a speech, a written work, or a conference.
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entertainmentlifestylemusicThe note on which a musical key is based; the tonic.
keynoteverb/ˈkiːˌnoʊt/
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To deliver a speech that sets the main theme of a conference or other gathering.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。