1 [mass noun] the attainment or acquisition of a position of rank or power:the Queen’s accession to the throne
the action or process of formally joining or being accepted by an institution or group:the accession of Spain and Portugal to the EU
the formal acceptance of a treaty or agreement:accession to the Treaty of Rome was effected in 1971
2a new item added to an existing collection of books, paintings, or artefacts:the day-to-day work of cataloguing new accessions [as modifier]:the accession number
an amount added to an existing quantity of something:substantial accessions of gold
ზმნა
Universal
record the addition of (a new item) to a library, museum, or other collection:each book must be accessioned and the data entered into the computer