What is Non Obstante?

Legal Definition
Engl. law. These words, which literally signify notwithstanding, are used to express the act of the English king, by which he dispenses with the law, that is, authorizes its violation.

2. He cannot by his license or dispensation make an offence dispunishable which is malum in se; but in certain matters which are mala prohibita, be may, to certain persons and on special occasions, grant a non obstante. 1 Th. Co. Litt. 76, n. 19; Vaugh. 330 to 359; Lev. 217; Sid. 6, 7; 12 Co. 18; Bac. Ab. Prerogative, D. 7. Vide Judgment non obstante veredicto.
-- Bouviers Law Dictionary
Legal Definition
Lat. Notwithstanding. Words anciently used in public and private instruments, intended to preclude, in advance, any interpretation contrary to certain declared objects or purposes. Burrill. A clause frequent in old English statutes and letters patent, (so termed from its initial words,) importing a license from the crown to do a thing which otherwise a person would be restrained by act of parliament from doing. Crabb, Com. Law, 570; Plowd. 501; Cowell. A power in the crown to dispense with the laws in any particular case. This was abolished by the bill of rights at the Revolution. 1 Bl. Comm. 342. See Non obstante veredicto.
-- Black's Law Dictionary
Legal Definition
-- Ballentine's Law Dictionary