Source : Webster's Revised Unabridged Dictionary (1913)

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®

dialectical
     adj 1: of or relating to logical disputation; "a dialectical weapon
            against his opponent"
     2: of or relating to or employing dialectic; "the dialectical
        method" [syn: {dialectic}]