Source : Webster's Revised Unabridged Dictionary (1913)

Imaginable \Im*ag"i*na*ble\, a. [L. imaginabilis: cf. F.
   imaginable.]
   Capable of being imagined; conceivable.

         Men sunk into the greatest darkness imaginable.
                                                  --Tillotson.
   -- {Im*ag"i*na*ble*ness}, n. -- {Im*ag"i*na*bly}, adv.

Source : WordNet®

imaginable
     adj : possible to conceive or imagine; "that is one possible
           answer" [syn: {conceivable}, {possible}]