expository

[ik-spoz-i-tawr-ee, -tohr-ee]
adjective
of the nature of exposition; serving to expound, set forth, or explain: an expository essay; expository writing.
Also, expositive.


Origin:
1590–1600; < Medieval Latin expositōrius. See expositor, -tory1

expositorily, expositively, adverb
semiexpositive, adjective
semiexpository, adjective
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World English Dictionary
expository or expositive (ɪkˈspɒzɪtərɪ, -trɪ)
 
adj
of, involving, or assisting in exposition; explanatory
 
expositive or expositive
 
adj
 
ex'positorily or expositive
 
adv
 
ex'positively or expositive
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

expository
1620s, from M.L. expositorius, from expositor, from exponere (see expound).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
However, he too often employs lengthy expository quotes and protracted
  stretches of trial transcript.
The words, which were given to music, have only an expository value.
He avoids artiness, writes clear expository prose and has the ability to create
  real people.
The constant stream of expository dialogue becomes laughable after a while.
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