A spoken lesson or exposition, usually delivered to a group.
During class today the professor delivered an interesting lecture.
A class that primarily consists of a (weekly or other regularly held) lecture (as in sense 1), usually at college or university.
We will not have lecture tomorrow.
A berating or scolding, especially if lengthy, formal or given in a stern or angry manner.
I really don't want you to give me a lecture about my bad eating habits.
From Middle English lecture, lectour, letture, letteur, lettur, lectury, from Medieval Latin or Late Latin lectura (“reading”), from Latin lectus, past participle of legō (“I read, I recite”).
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Emily's father lectured her about the importance of being home before midnight.