discourse -- (extended verbal expression in speech or writing)
sermon, discourse, preaching -- (an address of a religious nature (usually delivered during a church service))
discussion, treatment, discourse -- (an extended communication (often interactive) dealing with some particular topic; "the book contains an excellent discussion of modal logic"; "his treatment of the race question is badly biased")
Overview of verb discourse
The verb discourse has 3 senses
discourse, talk about, discuss -- (to consider or examine in speech or writing; "The author talks about the different aspects of this question"; "The class discussed Dante's `Inferno'")
hold forth, discourse, dissertate -- (talk at length and formally about a topic; "The speaker dissertated about the social politics in 18th century England")