Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Deaccession" Definition
noun
The official removal of an item from a library, museum, or art gallery in order to sell it.
Source: Oxford Dictionary
verb
To sell or otherwise dispose of (an item in a collection) .
Source: Merriam-Webster
Officially remove (an item) from a library, museum, or art gallery in order to sell it.
Source: Oxford Dictionary
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