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Definition of excommunicate : 1. Excommunicated; interdicted from the rites of the church.
2. One excommunicated.
3. To lay under the ban of the church; to interdict.
4. To put out of communion; especially, to cut off, or shut out, from communion with the church, by an ecclesiastical sentence.

Synonyms:

maledict, swear, anathemise, bedamn, damn, anathemize, imprecate, cuss, beshrew, curse, blaspheme, anathematize, dismiss, unchurch

deny, ban, excise, disqualify, ignore, forbid, renounce, prohibit, bar, disallow, proscribe, repudiate, amputate, eradicate, relegate

blacklist, deport, cordon, expatriate, boycott, banish, eliminate, sequester, expel, exclude, extradite, segregate, confine, evict, cloister, detach, reject, exile, oust, closet, isolate, alienate, extirpate, ostracize, screen, separate, seclude, blackball, insulate, remove, disbar, eject

Usage examples:

• The inquisitors of Saragossa, regardless of these regulations, commenced proceedings against the chief justice, and in 1591 threatened to excommunicate him. - "The History of the Inquisition of Spain from the Time of its Establishment to the Reign of Ferdinand VII.", Juan Antonio Llorente.
• A serious look shall be a Jury to excommunicate any man from our company. - "The Scornful Lady", Francis Beaumont and John Fletcher.
• Know you not that everywhere the Rabbis fight desperately against the new Order, that they curse and excommunicate its members. - "Dreamers of the Ghetto", I. Zangwill.