de·ac·ces·sion 
(dē′ăk-sĕshən)
(dē′ăk-sĕshən)v. de·ac·ces·sioned, de·ac·ces·sion·ing, de·ac·ces·sions
v.tr.
To remove (an object) from a collection, especially in order to sell it and purchase other objects: "He also denied that ... friends of the museum were permitted to buy ... pieces that were deaccessioned" (New York Times).
v.intr.
To remove an object or objects from a collection.
de′ac·cession n.