The Collaborative International Dictionary of English v.0.48:
Expository \Ex*pos"i*to*ry\, a. Pertaining to, or containing, exposition; serving to explain; explanatory; illustrative; exegetical. [1913 Webster] A glossary or expository index to the poetical writers. --Johnson. Ex post factoWordNet (r) 3.0 (2006):
expository adj 1: serving to expound or set forth; "clean expository writing" [syn: expository, expositive]