C2 noun /əkˈsɛʃən/
accession
восхождение на трон / принятие договора
Meaning
the attainment of a position of rank or power, especially a monarch or president; the formal acceptance of an agreement or treaty
Example
The king's accession to the throne was celebrated with great ceremony.
Восхождение короля на трон было отмечено великой церемонией.