Dictionary

A spoken lesson or exposition, usually delivered to a group.

Example: During class today the professor delivered an interesting lecture.

(by extension) a class that primarily consists of a (weekly or other regularly held) lecture (as in sense 1) [usually at college or university]

Example: Lecture notes are online.

A berating or scolding.

Example: I really don't want you to give me a lecture about my bad eating habits.

The act of reading.

Example: the lecture of Holy Scripture

To teach (somebody) by giving a speech on a given topic.

Example: The professor lectured to two classes this morning.

To preach, to berate, to scold.

Example: Emily's father lectured her about the importance of being home before midnight.