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Definition of excommunication : The act of communicating or ejecting; esp., an ecclesiastical censure whereby the person against whom it is pronounced is, for the time, cast out of the communication of the church; exclusion from fellowship in things spiritual.

Synonyms:

cutting out, animadversion, riddance, deracination, expulsion, elision, cut, exception, deletion, ablation, censure

denial, repudiation, abscission, banishment, relegation, eradication, exile, disallowance, prohibition, ejection, proscription, boycott, excision, deportation, amputation, expatriation, exclusion, forbiddance, ostracism, rejection, extradition, disbarment, removal, ban, elimination, renouncement

confinement, loneliness, aloneness, segregation, separation, misanthropy, captivity, isolation, standoffishness, aloofness, detachment, reclusion, solitude, apartheid, seclusion, xenophobia, anonymity, alienation, extirpation

dismissal, damnation, suspension

Usage examples:

• The senator noticed everything, and the priest took his leave, most likely with feelings of mortified repentance, for this time I most verily deserved excommunication by the extreme studied elegance of my curling hair. - "The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons", Jacques Casanova de Seingalt.
• Banishment was the sentence pronounced, and after the church which had so lately caressed and courted Mrs. Hutchinson had in its turn visited upon her the verdict of excommunication, her husband sold all his property and removed with his family to the island of Aquidneck, as did also many others whose opinions had brought them under the censure of the governing powers. - "The Romance of Old New England Rooftrees", Mary Caroline Crawford.
• Then it was announced throughout the whole army by the Marquis Boniface of Montferrat, who was head of the army, and by the barons and the Doge of Venice, that all the booty should be collected and assessed under pain of excommunication. - "The Best of the World's Classics, Restricted to Prose, Vol. VII (of X)--Continental Europe I", Various.