Definitions for backstoryˈbækˌstɔr i, -ˌstoʊr i
Random House Webster's College Dictionary
back•sto•ryˈbækˌstɔr i, -ˌstoʊr i(n.)(pl.)-ries.
the background of a real or fictional story or situation; prior circumstances or events.
Category: Common Vocabulary
Origin of backstory:
The supposed previous life and experiences of a character in a dramatic work.