The Collaborative International Dictionary
Expository \Ex*pos"i*to*ry\, a. Pertaining to, or containing, exposition; serving to explain; explanatory; illustrative; exegetical.
A glossary or expository index to the poetical writers.
--Johnson.
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Douglas Harper's Etymology Dictionary
1620s, from Medieval Latin expositorius, from exposit-, past participle stem of Latin exponere "set forth" (see expound). Earlier in English as a noun meaning "an expository treatise, commentary" (early 15c.). Related: Expositorial.
Wiktionary
a. Serving to explain, explicate, or elucidate; expositive; of or relating to exposition.
WordNet
adj. serving to expound or set fourth; "clean expository writing" [syn: expositive]
Usage examples of "expository".
Twenty-second century as if both of them had been there, the science fiction writer expostulating woozy expository lumps, and the Comic from the Future, never breaking character, turning it into schtick.
There is a fair amount of expository material about crypto that will be familiar to any Cypherpunk, hence not a reason to read the novel, and possibly a reason to avoid it.