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prologue

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The definition of a prologue is something that comes before an introduction to a book or play, or may be an action or situation that leads to something else.

(noun)

An introduction before a book begins is an example of a prologue.
Riots caused by dissatisfaction with the government may be a prologue to a revolution.

See prologue in Webster's New World College Dictionary

noun

an introduction to a poem, play, etc.; esp., introductory lines spoken by a member of the cast before a dramatic performance
the actor speaking such lines
a preliminary act or course of action foreshadowing greater events

Origin: ME prologe < MFr < L prologus < Gr prologos < pro-, before + logos, discourse: see pro- & logic

Also sp. prolog

See prologue in American Heritage Dictionary 4

also pro·log

noun