ab ‧ ro ‧ gate /ˈæbrəɡeɪt/ BrE AmE verb [transitive] formal
[ Date: 1500-1600 ; Language: Latin ; Origin: past participle of abrogare , from ab- 'away' + rogare 'to ask, suggest a law' ]
to officially end a legal agreement, practice etc:
Both governments voted to abrogate the treaty.
—abrogation /ˌæbrəˈɡeɪʃ ə n/ noun [uncountable and countable]