Definition of trilogy noun from the Oxford Advanced Learner's Dictionary

 

trilogy

 noun
noun
BrE BrE//ˈtrɪlədʒi//
 
; NAmE NAmE//ˈtrɪlədʒi//
 
(pl. trilogies)
 
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a group of three books, films/movies, etc. that have the same subject or characters
See the Oxford Advanced American Dictionary entry: trilogy