[ˈprəʊlɒɡ], (Noun)

Definitions:
- a separate introductory section of a literary, dramatic, or musical work
(e.g: the suppressed prologue to Women in Love)

- an event or act that leads to another
(e.g: the events from 1945 to 1956 provided the prologue to the post-imperial era)


Phrases:

Origin:
Middle English: from Old French, via Latin from Greek prologos, from pro- ‘before’ + logos ‘saying’