A statement or rhetorical discourse intended to give information about or an explanation of difficult material.
The art or technique of composing such discourses.
The first part of a composition in sonata form that introduces the themes.
The opening section of a fugue.
Music
The first part of a composition in sonata form that introduces the themes.
The opening section of a fugue.
The part of a play that provides the background information needed to understand the characters and the action.
An act or example of exposing.
A public exhibition or show, as of artistic or industrial developments.
[Middle English exposicioun, from Old French exposition, from Latin expositiō, expositiōn-, from expositus, past participle of expōnere, to expound; see expound.] ex·pos'i·tive (ĭk-spŏz'ĭ-tĭv), ex·pos'i·to'ry (-tôr'ē, -tōr'ē) adj., ex·pos'i·tor n.
[ik-spoz-i-tawr-ee, -tohr-ee] 
ɪˌtɔr