accession

noun
1
the act of getting a position of rank or power
به قدرت رسیدن, رسیدن به مقام یا منصب
see also accede
2
the act of becoming part of an international organization
الحاق, پیوستن, عضویت, انضمام
the accession of new member states to the EU
the new accession states of the EU
3
a thing that is added to a collection of objects, paintings, etc. in a library or museum
افزوده, افزوده جدید