accession - definition and synonyms

noun formal 

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/əkˈseʃ(ə)n/
singularaccession
pluralaccessions
  1. 1
    [countable/uncountable] the occasion on which someone formally takes a position of authority, especially as a king, queen, or president
  2. 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

  3. 3
    [countable] something that is added to a collection, especially a work of art