The Collaborative International Dictionary of English v.0.48:

Revocable \Rev"o*ca*ble\, a. [L. revocabilis: cf. F.
   r['e]vocable. See Revoke.]
   Capable of being revoked; as, a revocable edict or grant; a
   revocable covenant.
   [1913 Webster] -- Rev"o*ca*ble*ness, n. -- Rev"o*ca*bly,
   adv.
   [1913 Webster]