re·vert /ri-'vərt/ vi1: to come or go back (as to a former status or state)if the donee of a general power fails to exercise it...the appointive assets revert to the donor's estate — W. M. McGovern, Jr. et al.2: to return to the grantor or his or her heirs as a reversionre·vert·ible /-'vər-tə-bəl/ adj
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.
v.To return to an earlier state; for a property to return to its former owner or his or her heirs.n.reversion
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.