Gerund functioning as a mass noun meaning the act of expelling from church membership.
The excommunicating of the dissident priest shocked the entire diocese.
Отлучение инакомыслящего священника от церкви потрясло всю епархию.
excommunicatinggerund / present participle Present-participle adjective describing something that excommunicates or is related to excommunication.
The council issued an excommunicating edict against the sect.
Собор издал отлучающий указ против секты.