The Collaborative International Dictionary of English v.0.48:

Repealable \Re*peal"a*ble\ (r?-p?l"?-b'l), a.
   Capable of being repealed. -- Re*peal"a*ble*ness, n.
   [1913 Webster]

   Syn: Revocable; abrogable; voidable; reversible.
        [1913 Webster]