a process in which someone changes back to a religion or belief they previously followed

She made a silent deathbed re-conversion to Catholicism.

re-conversions of Christians back to Hinduism 基督徒重新皈依印度教

the act of changing a building or vehicle from its previous use for a second, third, etc. time

The council has permitted reconversion back to residential use. 该委员会已允许重新改建为住宅用途。

Vessels arrived at the boatyard 24 hours a day, for repairs, refits, and reconversions.