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                  A B C D E F G H I J K L M N O P Q R S T U V W Y
                  Ab Ac Ad Ag Ai Al Am An Ap Ar As At Au Av Aw
                  Acc Acq Acr Act

                  accession

                  a unit of records received from one source at one time, which are formally accepted into the holdings of an archive service. Typically, this provides initial control before records are processed and catalogued.