Source : Webster's Revised Unabridged Dictionary (1913)

Contradictory \Con`tra*dict"o*ry\, a. [LL. contradictorius: cf.
   F. contradictoire.]
   1. Affirming the contrary; implying a denial of what has been
      asserted; also, mutually contradicting; inconsistent.
      ``Contradictory assertions.'' --South.

   2. Opposing or opposed; repugnant.

            Schemes . . . contradictory to common sense.
                                                  --Addisn.

Contradictory \Con`tra*dict"o*ry\, n.; pl. {Contradictories}.
   1. A proposition or thing which denies or opposes another;
      contrariety.

            It is common with princes to will contradictories.
                                                  --Bacon.

   2. pl. (Logic) propositions with the same terms, but opposed
      to each other both in quality and quantity.

Source : WordNet®

contradictory
     adj 1: of words or propositions so related that both cannot be true
            and both cannot be false; "`perfect' and `imperfect'
            are contradictory terms"
     2: that confounds or contradicts or confuses [syn: {confounding}]
     3: in disagreement; "the figures are at odds with our
        findings"; "contradictory attributes of unjust justice and
        loving vindictiveness"- John Morley [syn: {at odds(p)}, {conflicting},
         {self-contradictory}]
     4: unable to be both true at the same time [syn: {mutually
        exclusive}]
     n : two propositions are contradictories if both cannot be true
         (or both cannot be false) at the same time