#1 accession n. a process of increasing by addition (as to a collection or group); "the art collection grew through accession". wn
#2 accession v. make a record of additions to a collection, such as a library. wn
#3 accession n. (civil law) the right to all of that which your property produces whether by growth or improvement. wn
#4 accession n. [addition] something added to what you already have; "the librarian shelved the new accessions"; "he was a new addition to the staff". wn
#5 accession n. [assenting] agreeing with or consenting to (often unwillingly); "accession to such demands would set a dangerous precedent"; "assenting to the Congressional determination". wn
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