Meaning of “accession” in the English Dictionary

british dictionary

"accession" in British English

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accessionnoun [ U ]

uk /əkˈseʃ.ən/ us /əkˈseʃ.ən/

formal the time when someone starts a position of authority, especially a king or queen:

1926 was the year of Emperor Hirohito's accession to the throne.

the time when a country officially joins a group of countries or signs an agreement:

Poland's accession to the EU

(Definition of “accession” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)