excommunication (n.) Look up excommunication at Dictionary.com
mid-15c., from Late Latin excommunicationem (nominative excommunicatio), noun of action from past participle stem of excommunicare "put out of the community," in Church Latin "to expel from communion," from ex "out" (see ex-) + communicare "to share, communicate," related to communis "common" (see common (adj.)).