/dee'ak sesh"euhn/ , v.t.
1. to sell (a work of art) from a museum's or gallery's collections, esp. with a view to acquiring funds for the purchase of other works.
v.i.
2. to deaccession a work of art from a museum's or gallery's collections.
n.
3. a deaccessioned work of art.
Also, de-accession .
[ 1970-75; DE- + ACCESSION ]