ac·ces·sion 
/ɪkˈsɛʃən/ noun
plural ac·ces·sions /ɪkˈsɛʃən/ noun formal 1 [noncount] : the act or process by which someone rises to a powerful and important position
▪ the accession of Queen Elizabeth II — often + to ▪ Queen Victoria's accession to the crown/throne occurred in 1837. [=she became queen in 1837] ▪ upon his accession to the Supreme Court ▪ the king's accession to power 2 [count] : something that is added to a collection at a museum
▪ The museum has put its latest accessions [=acquisitions] on display.
▪ the accession of Queen Elizabeth II — often + to ▪ Queen Victoria's accession to the crown/throne occurred in 1837. [=she became queen in 1837] ▪ upon his accession to the Supreme Court ▪ the king's accession to power
▪ The museum has put its latest accessions [=acquisitions] on display.
