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English definition of “prologue”

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prologue

noun uk   /ˈprəʊ.lɒɡ/ us    /ˈproʊ.lɑːɡ/
[C] a part that comes at the beginning of a play, story, or long poem, often giving information about events that happened before the time when the play, story, or poem begins
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[S] literary a series of events that happen before the main event and are related to it: informal A series of internal struggles was the prologue to full-scale civil war.
(Definition of prologue from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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