Source : Webster's Revised Unabridged Dictionary (1913)

Cognoscible \Cog*nos"ci*ble\, a.
   1. Capable of being known. ``Matters intelligible and
      cognoscible.'' --Sir M. Hale.

   2. Liable to judicial investigation. --Jer. Taylor.

Source : WordNet®

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