Source : Webster's Revised Unabridged Dictionary (1913)

Cognizable \Cog"ni*za*ble\ (? or ?), a. [F. connaissable, fr.
   conna[^i]tre to know, L. cognoscere. See Cognition.]
   1. Capable of being known or apprehended; as, cognizable
      causes.

   2. Fitted to be a subject of judicial investigation; capable
      of being judicially heard and determined.

            Cognizable both in the ecclesiastical and secular
            courts.                               --Ayliffe.

Source : WordNet®

cognizable
     adj : capable of being known [syn: {knowable}, {cognisable}, {cognoscible}]
           [ant: {unknowable}]