a·demp·tion 
(ə-dĕmpshən)
(ə-dĕmpshən)n.
The failure of certain property to be passed on by will because such property is no longer owned by the testator or because the testator nullified the legacy by some act subsequent to the making of the will.
[Latin adēmptiō, adēmptiōn-, a taking away, from adēmptus, past participle of adimere, to take away : ad-, ad- + emere, to buy, take; see em- in the Appendix of Indo-European roots.]