Source : Webster's Revised Unabridged Dictionary (1913)

Mistake \Mis*take"\, v. t. [imp. & obs. p. p. {Mistook}; p. p.
   {Mistaken}; p. pr. & vb. n. {Mistaking}.] [Pref. mis- + take:
   cf. Icel. mistaka.]
   1. To take or choose wrongly. [Obs. or R.] --Shak.

   2. To take in a wrong sense; to misunderstand misapprehend,
      or misconceive; as, to mistake a remark; to mistake one's
      meaning. --Locke.

            My father's purposes have been mistook. --Shak.

   3. To substitute in thought or perception; as, to mistake one
      person for another.

            A man may mistake the love of virtue for the
            practice of it.                       --Johnson.

   4. To have a wrong idea of in respect of character,
      qualities, etc.; to misjudge.

            Mistake me not so much, To think my poverty is
            treacherous.                          --Shak.

Mistook \Mis*took"\,
   imp. & obs. p. p. of {Mistake}.

Source : WordNet®

mistake
     n 1: a wrong action attributable to bad judgment or ignorance or
          inattention; "he made a bad mistake"; "she was quick to
          point out my errors"; "I could understand his English in
          spite of his grammatical faults" [syn: {error}, {fault}]
     2: an understanding of something that is not correct; "he
        wasn't going to admit his mistake"; "make no mistake about
        his intentions"; "there must be some misunderstanding--I
        don't have a sister" [syn: {misunderstanding}, {misapprehension}]
     3: part of a statement that is not correct; "the book was full
        of errors" [syn: {error}]
     [also: {mistook}, {mistaken}]

mistake
     v 1: identify incorrectly; "Don't mistake her for her twin
          sister" [syn: {misidentify}]
     2: to make a mistake or be incorrect [syn: {err}, {slip}]
     [also: {mistook}, {mistaken}]

mistook
     See {mistake}