excommunicate

Concise Oxford English Dictionary © 2008 Oxford University Press:
excommunicate

▶verb /ˌɛkskəˈmjuːnɪkeɪt/ officially exclude from participation in the sacraments and services of the Christian Church. ▶adjective /ˌɛkskəˈmjuːnɪkət/ excommunicated. ▶noun /ˌɛkskəˈmjuːnɪkət/ an excommunicated person.

– derivatives
excommunication noun,
excommunicative adjective,
excommunicator noun,
excommunicatory adjective.

– origin ME: from eccles. L. excommunicat-, excommunicare, from ex- ‘out’ + L. communis ‘common to all’.