v., The recording of the formal acceptance into custody of an acquisition. [Archives] 
n., An acquisition so recorded. (see definition for accession). [Archives] 
v., To enter in an accessions record or register particulars of each item in the order of its acquisition. [Computer and Information
Sciences] 
v., The act of taking documents into physical custody in an archival agency, records center, or manuscript repository, and
recording same. In some cases transfer of legal title may also be involved. [Compu