noun
excommunication
eks-kuh-myoo-nih-KAY-shun/ˌekskəˌmjuːnɪˈkeɪʃn/
Formal exclusion from membership or participation in a church community.
After excommunication, a worshiper stands outside the church’s closed doors.

Etymology
The underlying idea is being put ‘out’ of sharing in a community. In church use, this means formal deprivation of communion and religious privileges, rather than merely an end to exchanging messages.
In context
Excommunication meant spiritual death. The church declared, "You cut off from the sacraments, no mass, no confession, no Christian burial."
More examples
- The bishop threatens excommunication if the priest refuses to recant.
- Her excommunication prevents her from receiving communion.
- The church lifts his excommunication after he reconciles with its leaders.
Forms
excommunication · excommunications
excommunicate verb — To formally exclude someone from church participation.