Definition of accession noun from the Oxford Advanced American Dictionary

     

    accession

     noun
    noun
    NAmE//əkˈsɛʃn//
     
     
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  1. 1 [uncountable] accession (to something) the act of becoming a ruler of a country the accession of the queen to the throne see also accede
  2. 2 [uncountable] accession (to something) the act of becoming part of an international organization the accession of new member states to the EU in 2004
  3. 3[countable] (technology) a thing that is added to a collection of objects, paintings, etc. in a library or museum
See the Oxford Advanced Learner's Dictionary entry: accession