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English definition of “accession”

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accession

noun [U] uk   /əkˈseʃ.ən/ us  
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 Learners Dictionary & Thesaurus © Cambridge University Press)
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