Noun

• S: (n) accession (a process of increasing by addition (as to a collection or group)) "the art collection grew through accession"
• S: (n) accession ((civil law) the right to all of that which your property produces whether by growth or improvement)
• S: (n) accession, addition (something added to what you already have) "the librarian shelved the new accessions"; "he was a new addition to the staff"
• S: (n) accession, assenting (agreeing with or consenting to (often unwillingly)) "accession to such demands would set a dangerous precedent"; "assenting to the Congressional determination"
• S: (n) entree, access, accession, admission, admittance (the right to enter)
• S: (n) 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"

Verb

• S: (v) accession (make a record of additions to a collection, such as a library)