ac·ces·sion /əkˈseʃən/ noun1 [uncountableU]PGO an official process in which someone becomes king, queen, president etc 登基,即位;就職 → successionaccession ofthe accession of James I 詹姆斯一世即位
accession to power/to the throne (=the act of becoming king, queen, president etc) 登上權位/王位