講 lecture

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Nancy Reagan said a lecture on the subject of drug frenzy: "Just say no."

a non-political speech ★★☆☆☆
講 (lecture) + 演 (performance) = 講演 (a non-political speech)

any public speech or talk given to a general audience. Authors doing a reading, dudes addressing a club, the graduation speaker at your graduation, are all doing 講演.

college lecture ★☆☆☆☆
講 (lecture) + 義 (righteousness) = 講義 (college lecture)