Longman Dictionary of Contemporary English homepage

lecture

2 verb
     
lecture2
1 [transitive] to talk angrily or seriously to someone in order to criticize or warn them, in a way that they think is unfair or unnecessary:
I wish you'd stop lecturing me!
lecture somebody about/on something
He began to lecture us about making too much noise.
2 [intransitive] to talk to a group of people on a particular subject, especially to students in a university
lecture on
He lectures on European art at Manchester University.

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