NON-OBSERVANCE, noun Neglect or failure to observe or fulfill. Non obstante, [Latin Notwithstanding, ] a clause in statutes and letters patent, importing a license form the king to do a thing which at common law might be lawfully done, but being restrained by act of parliament, cannot be done without such license.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI