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.)).