Source : Webster's Revised Unabridged Dictionary (1913)

Cogitable \Cog"i*ta*ble\, a. [L. cogitabilis, fr. cogitare to
   think.]
   Capable of being brought before the mind as a thought or
   idea; conceivable; thinkable.

         Creation is cogitable by us only as a putting forth of
         divine power.                            --Sir W.
                                                  Hamilton.

Source : WordNet®

cogitable
     adj : possible to ponder; "space flight to other galaxies becomes
           more cogitable" [syn: {ponderable}]