Past tense: removed from a collection permanently; as an adjective: referring to an item that has been officially removed from institutional ownership.
Past tense of 'deaccession,' formed regularly with the '-ed' suffix; the verb itself is a recent formation (late 20th century) created by adding 'de-' (reverse) to 'accession,' reflecting professionalization of museum practice.
When museums 'deaccession' items, especially art, it's often controversial — in 2020, museums deaccessioned during the pandemic for operating funds, leading to heated debates about whether this was responsible stewardship or betrayal of donors' intentions!
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