Noun

(wikipedia backstory) (backstories)

The previous life and experiences of a character in a dramatic work.

* {{quote-news, year=2004, date=January 16, author=Kelly Kleiman, title=Her Side of the Story, work=Chicago Reader citation

, passage=These backstories cast the characters' behavior in a new light: of course Gertrude would promptly marry the man who saved her from abuse; of course Ophelia would be desperate and indiscreet in seeking Hamlet's love.}}

* A fictitious account of a person's history designed to conceal their actual history and motives; a cover story.

A prequel.

Noun

(en noun)

The beginning of something.

The source of a river, information, goods, etc.

* {{quote-magazine, date=2013-06-14, author= Sam Leith

, volume=189, issue=1, page=37, magazine=(The Guardian Weekly) , title= Where the profound meets the profane , passage=Swearing doesn't just mean what we now understand by "dirty words". It is entwined, in social and linguistic history, with the other sort of swearing: vows and oaths. Consider for a moment the origins of almost any word we have for bad language – "profanity", "curses", "oaths" and "swearing" itself.}}

(mathematics) The point at which the axes of a coordinate system intersect.

(anatomy) The proximal end of attachment of a muscle to a bone that will not be moved by the action of that muscle.

(cartography) An arbitrary point on the earth's surface, chosen as the zero for a system of coordinates.

(in the plural) Ancestry.