Quick definitions from WordNet (accession)
▸ noun: the act of attaining or gaining access to a new office or right or position (especially the throne) ("Elizabeth's accession in 1558")
▸ noun: agreeing with or consenting to (often unwillingly) ("Accession to such demands would set a dangerous precedent")
▸ noun: something added to what you already have ("The librarian shelved the new accessions")
▸ noun: (civil law) the right to all of that which your property produces whether by growth or improvement
▸ noun: a process of increasing by addition (as to a collection or group) ("The art collectin grew through accession")
▸ noun: the right to enter
▸ verb: make a record of additions to a collection, such as a library
▸ Also see accession
▸ noun: the act of attaining or gaining access to a new office or right or position (especially the throne) ("Elizabeth's accession in 1558")
▸ noun: agreeing with or consenting to (often unwillingly) ("Accession to such demands would set a dangerous precedent")
▸ noun: something added to what you already have ("The librarian shelved the new accessions")
▸ noun: (civil law) the right to all of that which your property produces whether by growth or improvement
▸ noun: a process of increasing by addition (as to a collection or group) ("The art collectin grew through accession")
▸ noun: the right to enter
▸ verb: make a record of additions to a collection, such as a library
▸ Also see accession