Definitions of reversion
the act of returning property to its original owner, especially the return of property to the grantor (=the giver) or the grantor's heirs by operation of law after the period of grant is over
Although a reversion of plan assets to the Employers may be permitted by the plan terms, such a reversion would not be consistent with Title I of the agreement.
the act of returning something to a previous state
People are concerned that a reversion to the drachma would wipe out much of their savings.