accession, addition - something added to what you already have; "the librarian shelved the new accessions"; "he was a new addition to the staff" --3is a kind ofacquisition
accession, assenting - agreeing with or consenting to (often unwillingly); "accession to such demands would set a dangerous precedent"; "assenting to the Congressional determination" --4is a kind ofagreement
accession, rise to power - the act of attaining or gaining access to a new office or right or position (especially the throne); "Elizabeth's accession in 1558" --6is a kind ofattainment