accession

something added to what you already have

“the librarian shelved the new accessions”

agreeing with or consenting to (often unwillingly)

“accession to such demands would set a dangerous precedent”

the act of attaining or gaining access to a new office or right or position (especially the throne)

“Elizabeth's accession in 1558”

the right to enter

a process of increasing by addition (as to a collection or group)

“the art collection grew through accession”

the right to all of that which your property produces whether by growth or improvement

make a record of additions to a collection, such as a library