accession
/ɪkˈsɛʃən/
noun
plural
accessions
plural
accessions
Britannica Dictionary definition of ACCESSION
formal
1
[noncount]
:
the act or process by which someone rises to a powerful and important position
—
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