whit definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the least bit; jot; iota: chiefly in negative constructions: not a whit the wiser
Origin: Early Modern English respelling of wiht, a wight
whit definition by American Heritage Dictionary
The least bit; an iota: doesn't give a whit what was said; not a whit afraid.
Origin: Middle English, amount, from Old English wiht; see wight1.