Webster's English Dictionary

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prologue

pro.logue \'pro--.lo.g, -.la:g\ n [ME prolog, fr. OF prologue, fr. L 
   prologus preface to a play], fr. Gk prologos part of a Greek play preceding 
   the entry of the chorus, fr. pro- before + legein to speak - more at PRO-, 
   LEGEND 1: the preface or introduction (as to a discourse or play)  2: the 
   actor speaking a prologue  3: an introductory or preceding act, event, or 
   development