Source : Webster's Revised Unabridged Dictionary (1913)

Deliverable \De*liv"er*a*ble\, a.
   Capable of being, or about to be, delivered; necessary to be
   delivered. --Hale.

Source : WordNet®

deliverable
     adj : suitable for or ready for delivery
     n : something that can be provided as the product of
         development; "under this contract the deliverables
         include both software and hardware"