Webster's English Dictionary

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exposition

ex.po.si.tion \.ek-sp*-'zish-*n\ \-'zish-n*l, -*n-*l\ n 1: a setting forth 
   of the meaning or purpose (as of a writing)  2a: discourse or an example of 
   it designed to convey information or explain  what is difficult to 
   understand 2b1: the first part of a musical composition in sonata form  
   2b2: the opening section of a fugue  3: an act or an instance of exposing : 
   as  3a: abandonment of an infant  3b: a public exhibition or show  - 
   ex.po.si.tion.al aj