term:

Reverter

reverter n

[Anglo-French, from reverter to return, from Old French revertir to return, revert, from Latin revertere to turn back]
1 : reversion
2 : possibility of reverter NOTE: Although reversion and possibility of reverter or reverter are sometimes used synonymously, many authorities disapprove such use.

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