Whither Definition
 wĭthər, hwĭth- 
    adverb
  
 To what place, point, condition, result, etc.? where?
 Whither are we drifting?
 Webster's New World 
    conjuntion
  
 To which specified place or position.
 Landed on the shores whither the storm had tossed them.
 American Heritage 
To which place, point, condition, result, etc.
 The island whither we drifted.
 Webster's New World 
To whatever place, point, condition, result, etc.; wherever.
 Let them go whither they will.
 Webster's New World 
    verb
  
 (intransitive, obsolete, dialectal) To wuther.
Wiktionary 
Origin of Whither
-  
Middle English from Old English hwider kwo- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 From Old English hwæder.
From Wiktionary
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