reversion is the act of returning. the part of a simple estate remaining in the control of its owner after the owner has granted therefrom a lesser particular estate. a future interest in property left in the control of a grantor or the grantor's successor. the right of succession or future possession or enjoyment. an act or the process of returning (as to a former condition) a return toward an ancestral type or condition: reappearance of an ancestral character an act or instance of turning the opposite way: the state of being so turned June