disfellowship
Concise Oxford English Dictionary © 2008 Oxford University Press:
disfellowship/dɪsˈfɛlə(ʊ)ʃɪp/
▶noun exclusion from fellowship, especially as a form of discipline in some Protestant and Mormon Churches. ▶verb (disfellowships, disfellowshipping, disfellowshipped) exclude from fellowship.
'disfellowship' also found in these Oxford entries:

