term:

Ademption

ademption n

[Latin ademptio, from adimere to take away, from ad to + emere to buy, obtain]
1 : the revocation of a gift in a will inferred from the disposal (as by sale) of the property by the maker of the will before he or she dies
2 : the revocation of a gift in a will inferred from the maker's gift before his or her death of the same or similar property to the recipient named in the will compare advancement NOTE: Only gifts that are characterized as specific devises, bequests, or legacies are subject to ademption.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.