A setting forth of meaning or intent. A statement or rhetorical discourse intended to give information about or an explanation of difficult material. The art or technique of composing such discourses. 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.