Definition of expository adjective from the Oxford Advanced Learner's Dictionary

 

expository

 adjective
adjective
BrE BrE//ɪkˈspɒzətri//
 
; NAmE NAmE//ɪkˈspɑːzətɔːri//
 
(formal)
 
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intended to explain or describe something The film suffers from too much expository dialogue.
See the Oxford Advanced American Dictionary entry: expository