Source : Webster's Revised Unabridged Dictionary (1913)

Disposable \Dis*pos"a*ble\, a. [From {Dispose}.]
   Subject to disposal; free to be used or employed as occasion
   may require; not assigned to any service or use.

         The great of this kingdom . . . has easily afforded a
         disposable surplus.                      --Burke.

Source : WordNet®

disposable
     adj 1: free or available for use or disposition; "every disposable
            piece of equipment was sent to the fire"; "disposable
            assets" [ant: {nondisposable}]
     2: designed to be disposed of after use; "disposable paper
        cups" [ant: {nondisposable}]