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

 

prologue

 noun
noun
BrE BrE//ˈprəʊlɒɡ//
 
; NAmE NAmE//ˈproʊlɔːɡ//
 
, NAmE//ˈproʊlɑːɡ//
 
Elements of a play
 
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a speech, etc. at the beginning of a play, book, or film/movie that introduces it the Prologue to Chaucer’s ‘Canterbury Tales’ compare epilogue See related entries: Elements of a play Word Origin Middle English: from Old French, via Latin from Greek prologos, from pro- ‘before’ + logos ‘saying’.
See the Oxford Advanced American Dictionary entry: prologue