Prologue

prologue [ PROH-lawg ]
[ noun, verb ]

MEANING :
1. (n.) an introductory part or preface to a literary piece or speech
2. (n.) the actor who delivers an introduction
3. (v.) to introduce with

USAGE EXAMPLE 1 :
After reading the prologue which was not to his liking he returned the book to the library without reading it.

USAGE EXAMPLE 2 :
The prologue, by the first of many narrators, explains that the story takes place in “that golden age which nobody noticed… at the time”: between the fall of the Berlin Wall and the attack on the World Trade Center.