Source : Webster's Revised Unabridged Dictionary (1913)

Returnable \Re*turn"a*ble\, a.
   1. Capable of, or admitting of, being returned.

   2. (Law) Legally required to be returned, delivered, given,
      or rendered; as, a writ or precept returnable at a certain
      day; a verdict returnable to the court.

Source : WordNet®

returnable
     adj : that may be returned; "returnable bottles and cans"; "this
           merchandise is returnable if you save the receipt"
           [ant: {nonreturnable}]