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1.
Archaic adverb meaning "from where" or "from what source." Anyone who uses this term seriously is either affected or was born two hundred years ago.

Saying "from whence" is redundant, as "whence," on its own, already means "from where." Anyone who says "from whence" is an arrogant moron.
A: Whence did you come this fine morning?
B: The cherry orchard is whence I came.
A: Splendid!
B: Indubitably!
by Gus March 12, 2005