say it: uhk-SESH-uhn
accession is a noun and verb meaning "a process of increasing by addition (as to a collection or group)". It carries 7 recorded senses.
a process of increasing by addition (as to a collection or group)
“the art collection grew through accession”
(civil law) the right to all of that which your property produces whether by growth or improvement
civil law
something added to what you already have
“the librarian shelved the new accessions”
“he was a new addition to the staff”
the act of attaining or gaining access to a new office or right or position (especially the throne)
“Elizabeth's accession in 1558”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for accession come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.