The Collaborative International Dictionary of English v.0.48:

Contradictory \Con`tra*dict"o*ry\, n.; pl. Contradictories.
   1. A proposition or thing which denies or opposes another;
      contrariety.
      [1913 Webster]

            It is common with princes to will contradictories.
                                                  --Bacon.
      [1913 Webster]

   2. pl. (Logic) propositions with the same terms, but opposed
      to each other both in quality and quantity.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   2. Opposing or opposed; repugnant.
      [1913 Webster]

            Schemes . . . contradictory to common sense.
                                                  --Addisn.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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, contradictory]
    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, contradictory, self-contradictory]
    4: unable to be both true at the same time [syn:
       contradictory, mutually exclusive]
    n 1: two propositions are contradictories if both cannot be true
         (or both cannot be false) at the same time