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

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

expositorily, expositively, adverb
semiexpositive, adjective
semiexpository, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expository or expositive (ɪkˈspɒzɪtərɪ, -trɪ)
of, involving, or assisting in exposition; explanatory
expositive or expositive
ex'positorily or expositive
ex'positively or expositive

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

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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