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

 

whodunnit

 noun
(British English)(also whodunit North American English, British English)noun
BrE BrE//ˌhuːˈdʌnɪt//
 
; NAmE NAmE//ˌhuːˈdʌnɪt//
 
(informal) Types of play, Types of story
 
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a story, play, etc. about a murder in which you do not know who did the murder until the end See related entries: Types of play, Types of story Word Origin 1930s: from who done it?, non-standard form of who did it?