- 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[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[countable] (specialist) a thing that is added to a collection of objects, paintings, etc. in a library or museum 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’.
Check pronunciation: accession
