The Collaborative International Dictionary of English v.0.48:

Contradict \Con`tra*dict"\, v. t. [imp. & p. p. Contradicted;
   p. pr. & vb. n. Contradicting.] [L. contradictus, p. p. of
   contradicere to speak against; contra + dicere to speak. See
   Diction.]
   1. To assert the contrary of; to oppose in words; to take
      issue with; to gainsay; to deny the truth of, as of a
      statement or a speaker; to impugn.
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            Dear Duff, I prithee, contradict thyself,
            And say it is not so.                 --Shak.
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            The future can not contradict the past.
                                                  --Wordsworth.
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   2. To be contrary to; to oppose; to resist. [Obs.]
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            No truth can contradict another truth. --Hooker.
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            A greater power than we can contradict
            Hath thwarted our intents.            --Shak.
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