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]