Source : Webster's Revised Unabridged Dictionary (1913)

Manipulate \Ma*nip"u*late\, v. t. [imp. & p. p. {Manipulated};
   p. pr. & vb. n. {Manipulating}.] [LL. manipulatus, p. p. of
   manipulare to lead by the hand, fr. L. manipulus. See
   {Maniple}.]
   1. To treat, work, or operate with the hands, especially when
      knowledge and dexterity are required; to manage in hand
      work; to handle; as, to manipulate scientific apparatus.

   2. To control the action of, by management; as, to manipulate
      a convention of delegates; to manipulate the stock market;
      also, to manage artfully or fraudulently; as, to
      manipulate accounts, or election returns.