Source : Webster's Revised Unabridged Dictionary (1913)

Somewhere \Some"where`\, adv.
   In some place unknown or not specified; in one place or
   another. ``Somewhere nigh at hand.'' --Milton.

Source : WordNet®

somewhere
     n : an indefinite or unknown location; "they moved to somewhere
         in Spain"
     adv : in or at or to some place; "she must be somewhere";
           (`someplace' is used informally for `somewhere') [syn:
           {someplace}]