Definition of accession noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ækˈseʃn//
    ; NAmE NAmE//ækˈseʃn//
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  1. 1[uncountable] accession (to something) the act of becoming a ruler of a country the accession of Queen Victoria to the throne Charles I’s accession to the throne on her accession to the leadership 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 the new accession states of the EU
  3. 3[countable] (specialist) a thing that is added to a collection of objects, paintings, etc. in a library or museum
  4. Word Originlate 16th cent. (in the general sense ‘something added’): from Latin accessio(n-), from the verb accedere ‘approach, come to’ from ad- ‘to’ + cedere ‘give way, yield’.
See the Oxford Advanced American Dictionary entry: accession