Known as suppression.
But that's for religious. Does it also apply to parishes?
Suppression and deconsecration are not the same thing. Suppression refers to the parish (the congregation), deconsecration refers to the building. A few years ago my parish along with two neighboring parishes in the Diocese of Fall River were suppressed and a new parish formed located at the church building one block away from my church. My church continues to be used for daily mass, weddings and funerals for the new parish.