discourse

(noun) extended verbal expression in speech or writing.

(noun) an address of a religious nature (usually delivered during a church service). Synonyms: sermon, preaching.

(noun) an extended communication (often interactive) dealing with some particular topic. Synonyms: discussion, treatment. Examples: "The book contains an excellent discussion of modal logic." "His treatment of the race question is badly biased."

(verb) to consider or examine in speech or writing. Synonyms: talk about, discuss. Examples: "The author talks about the different aspects of this question." "The class discussed dante's `inferno'."

(verb) carry on a conversation. Synonyms: converse.

(verb) talk at length and formally about a topic. Synonyms: hold forth, dissertate. Example: "The speaker dissertated about the social politics in 18th century england."