RESERVATION n.
rm of canon law, which signifies that the pope reserves to himself appointment to certain benefices. Mental reservation, the withholding, or failing to disclose, something that affects a statement, promise, etc., and which, if disclosed, would materially change its import.
REVOCATION n.
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.