de-accession \¦dēˌ\verb alsode-ac·cess\¦deakˈses\ Etymology:de-accession from de- + accession; de-access back-formation from de-accession transitive verb : to remove and sell (a work of art) from an institution's (as a museum's or a library's) collection especially to raise funds to purchase other works of art intransitive verb : to de-accession a work of art or part of a collection • de·accessionnoun