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noun formal accession pronunciation in American English /əkˈseʃ(ə)n/ 
Word Forms
  1. 2
    [uncountable] the occasion when a country formally joins a group of countries or accepts an agreement

    China's accession to the World Trade Organization

    Synonyms and related words for this sense of accession
  2. 3
    [countable] something that is added to a collection, especially a work of art

    Recent accessions are in the north wing.


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