A lengthy lecture on a subject; a treatise; a discourse; a sermon.
A formal exposition of a subject, especially a research paper that students write in order to complete the requirements for a doctoral degree in the US and a non-doctoral degree in the UK; a thesis.
a class that primarily consists of a (weekly or other regularly held) lecture (as in sense 1)
A berating or scolding.
A spoken lesson or exposition, usually delivered to a group.
To preach, to berate, to scold.
To teach (somebody) by giving a speech on a given topic.