Definition of excommunication noun from the Oxford Advanced Learner's Dictionary

 

excommunication

 noun
noun
BrE BrE//ˌekskəˌmjuːnɪˈkeɪʃn//
 
; NAmE NAmE//ˌekskəˌmjuːnɪˈkeɪʃn//
 
[uncountable, countable]
 
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the act of punishing somebody by officially stating that they can no longer be a member of a Christian Church, especially the Roman Catholic Church They were threatened with excommunication.