Exposition

noun

1. The action of exposing something to something, such as skin to the sunlight.
2. (authorship) The act or process of declaring or describing something through either speech or writing; the portions and aspects of a piece of writing that exist mainly to describe the setting, characters and other non-plot elements.

   "My reviewer said she couldn't picture the setting for my story, so I'm improving the exposition."

3. The act of expulsion, or being expelled, from a place.
4. An event at which goods, artwork and cultural displays are exhibited for the public to view.

   "The first prototype was unveiled at an exposition."

5. (authorship) An essay or speech in which any topic is discussed in detail.

   "I turned my research into an exposition on the traditional music of Borneo."