accession
ac-ces-sion
noun
The formal act of achieving a position of power or office.
"Her Majesty's accession to the throne was in 1952."
noun
The formal agreement by a state to an international treaty or body.
"The country's accession to the EU was a complex process."
noun
The act of adding new items to a collection or library.
"The museum celebrated the accession of several new artefacts."
Thesaurus
Synonyms: admission, access, entree, admittance, addition, rise to power, assenting