lecture

A formal talk given to a group, often at a university or college.

"The professor gave a lecture on British history."

A long, serious talk given to someone criticising their behaviour.

"My mum gave me a lecture about my messy room."

To criticise someone's behaviour or actions in a long, serious way.

"Don't lecture me about my life choices."

To deliver a formal talk to a group, typically in an academic setting.

"She will lecture on modern art next Tuesday."