accession
ac·ces·sion
/ıkˈsɛʃən/ noun , pl -sions
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.
