Exposition
Part of speech: noun
Definition: The action of putting something out to public view; for example in a display or show. The act of declaring or describing something through either speech or writing. The act of expulsion, or being expelled, from a place. An essay or speech in which any topic is discussed in detail. A technique used in fiction, including novel, play, and movie, by which background information about the characters, events, or setting is conveyed. The first section of a fugue or other work in sonata-form
Example sentence: Besides the actual reading in class of many poems, I would suggest you do two things: first, while teaching everything you can and keeping free of it, teach that poetry is a mode of discourse that differs from logical exposition.
Expounding
Part of speech: verb
Definition: To set out the meaning of; to explain or discuss at length