Source : Webster's Revised Unabridged Dictionary (1913)

Dialectic \Di`a*lec"tic\, n.
   Same as {Dialectics}.

         Plato placed his dialectic above all sciences.
                                                  --Liddell &
                                                  Scott.

Dialectic \Di`a*lec"tic\, Dialectical \Di`a*lec"tic*al\, a. [L.
   dialecticus, Gr. ?: cf. F. dialectique. See {Dialect}.]
   1. Pertaining to dialectics; logical; argumental.

   2. Pertaining to a dialect or to dialects. --Earle.

Source : WordNet®

dialectic
     adj : of or relating to or employing dialectic; "the dialectical
           method" [syn: {dialectical}]

dialectic
     n 1: any formal system of reasoning that arrives at the truth by
          the exchange of logical arguments
     2: a contradiction of ideas that serves as the determining
        factor in their interaction; "this situation created the
        inner dialectic of American history"