Merriam-Webster's Collegiate® Dictionary, 11th Edition
WHITHER
I. adverb see: who Date: before 12th century to what place , to what situation, position, degree, or end ,
II. conjunction Date: before 12th century
1. to what place , to what situation, position, degree, or end,
2. to the place at, in, or to which, to which place, to whatever place