PGthe right of a country or leader to rule over another country 宗主权，宗主国的地位
Examples from the Corpus
suzerainty• To the east lay border regions - Berry and Auvergne - where even the Duke's nominal suzerainty was at times doubtful.• He did not ask for independence and never attempted to repudiate the suzerainty of the sultan.
Originsuzerainty
(1800-1900)Frenchsuzerainté, from an unrecorded Old Frenchsuserain“ruler”, from sus“up” + -erain (as in soverain“sovereign”)