Source : Webster's Revised Unabridged Dictionary (1913)

Apodeictic \Ap"o*deic"tic\, Apodictic \Ap`o*dic"tic\,
Apodeictical \Ap`o*deic"tic*al\, Apodictical \Ap`o*dic"tic*al\,
   a. [L. apodicticus, Gr. ?, fr. ? to point out, to show by
   argument; ? from + ? to show.]
   Self-evident; intuitively true; evident beyond contradiction.
   --Brougham. Sir Wm. Hamilton.

Source : WordNet®

apodeictic
     adj : of a proposition; necessarily true or logically certain
           [syn: {apodictic}]