The Collaborative International Dictionary of English v.0.48:

Whither \Whith"er\, adv. [OE. whider. AS. hwider; akin to E.
   where, who; cf. Goth. hvadr[=e] whither. See Who, and cf.
   Hither, Thither.]
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   1. To what place; -- used interrogatively; as, whither goest
      thou? "Whider may I flee?" --Chaucer.
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            Sir Valentine, whither away so fast?  --Shak.
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   2. To what or which place; -- used relatively.
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            That no man should know . . . whither that he went.
                                                  --Chaucer.
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            We came unto the land whither thou sentest us.
                                                  --Num. xiii.
                                                  27.
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   3. To what point, degree, end, conclusion, or design;
      whereunto; whereto; -- used in a sense not physical.
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            Nor have I . . . whither to appeal.   --Milton.
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   Any whither, to any place; anywhere. [Obs.] "Any whither,
      in hope of life eternal." --Jer. Taylor.

   No whither, to no place; nowhere. [Obs.] --2 Kings v. 25.
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   Syn: Where.

   Usage: Whither, Where. Whither properly implies motion to
          place, and where rest in a place. Whither is now,
          however, to a great extent, obsolete, except in
          poetry, or in compositions of a grave and serious
          character and in language where precision is required.
          Where has taken its place, as in the question, "Where
          are you going?"
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