su ‧ ze ‧ rainty /ˈsuːzəreɪnti $ -rənti, -reɪnti/ BrE AmE noun [uncountable] formal
[ Date: 1800-1900 ; Language: French ; Origin: suzerainté , from an unrecorded Old French suserain 'ruler' , from sus 'up' + -erain (as in soverain 'sovereign' ) ]
the right of a country or leader to rule over another country