excommunicate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To deprive of the right of church membership by ecclesiastical authority.
• transitive verb To exclude by or as if by decree from membership or participation in a group.
• noun A person who has been excommunicated.
• adjective Having been excommunicated.

from The Century Dictionary.

• Cut off from communion; excommunicated.
• noun One who is excommunicated; one cut off from any privilege.
• Eccles., to cut off by an ecclesiastical sentence, either from the sacraments of the church or from all fellowship and intercourse with its members. See excommunication.
• Hence To expel from and deprive of the privileges of membership in any association.
• To prohibit on pain of excommunication.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Excommunicated; interdicted from the rites of the church.
• transitive verb To put out of communion; especially, to cut off, or shut out, from communion with the church, by an ecclesiastical sentence.
• transitive verb To lay under the ban of the church; to interdict.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Excommunicated.
• noun A person so excluded.
• verb transitive To officially exclude someone from membership of a church or religious community.
• verb transitive To exclude from any other group; to banish.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb oust or exclude from a group or membership by decree
• verb exclude from a church or a religious community