Definition of prologue

< Prolog

prolong >

pro·logue also pro·log    (prlôg, -lg) KEY 

NOUN:

1. An introduction or preface, especially a poem recited to introduce a play.
2. An introduction or introductory chapter, as to a novel.
3. An introductory act, event, or period.

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ETYMOLOGY:
Middle English prolog, from Old French prologue, from Latin prologus, from Greek prologos : pro-, before ; see pro-² + logos, speech; see leg- in Indo-European roots