Discourse (noun)

1. Verbal or written communication or debate.
2. Formal conversation or debate.
3. Spoken or written communication about a particular subject.
4. An extended communication or discussion on a particular subject.
5. The verbal or written exchange of ideas and opinions.

Origin:

Late middle english (denoting formal conversation or debate): from old french discours, from latin discursus "running to and fro", from the verb discurrere (see discourse (verb)).

Examples:

1. The book is a discourse on the history of the city.
2. The discourse on the topic was quite informative.
3. He had a discourse with his friend about the latest news.
4. The lecture was a discourse on the current economic situation.
5. The discourse was lively and interesting.