[ex.po.si.tion] n (14c) 1: a setting forth of the meaning or purpose (as of a writing)
2. a: discourse or an example of it designed to convey information or explain what is difficult to understand b (1): the first part of a musical composition in sonata form in which the thematic material of the movement is presented (2): the opening section of a fugue
3: a public exhibition or show -- ex.po.si.tion.al adj