1. an educational talk to an audience, especially to students
2. a long serious speech criticizing someone’s behavior

1. to give an educational talk to an audience
2. to criticize someone at length about their behavior

Examples

• The professor gave a fascinating lecture on ancient history.
• Students took notes during the biology lecture.
• My parents gave me a lecture about staying out too late.
• She lectures at the university twice a week.
• He lectured his son about the importance of hard work.
• The guest speaker will lecture on climate change tomorrow.
• I don’t need another lecture about my grades.