From The Collaborative International Dictionary of English v.0.48:
Revocation \Rev`o*ca"tion\, n. [L. revocatio: cf. F.
r['e]vocation.]
1. The act of calling back, or the state of being recalled;
recall.
[1913 Webster]
One that saw the people bent for the revocation of
Calvin, gave him notice of their affection.
--Hooker.
[1913 Webster]
2. The act by which one, having the right, annuls an act
done, a power or authority given, or a license, gift, or
benefit conferred; repeal; reversal; as, the revocation of
an edict, a power, a will, or a license.
[1913 Webster]