Definition of tetralogy noun from the Oxford Advanced American Dictionary

 

tetralogy

 noun
noun
NAmE//tɛˈtrɑlədʒi//
 
, NAmE//tɛˈtrælədʒi//
 
(pl. tetralogies)
 
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a group of four books, movies, etc. that have the same subject or characters
See the Oxford Advanced Learner's Dictionary entry: tetralogy