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

 

tetralogy

 noun
noun
BrE BrE//teˈtrælədʒi//
 
; NAmE NAmE//teˈtrælədʒi//
 
(pl. tetralogies)
 
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a group of four books, films/movies, etc. that have the same subject or characters
See the Oxford Advanced American Dictionary entry: tetralogy