Merriam-Webster's Collegiate® Dictionary, 11th Edition
EXCOMMUNICATE
I. transitive verb
Etymology: Middle English, from Late Latin excommunicatus, past participle of excommunicare, from Latin ex- + Late Latin communicare to communicate
Date: 15th century
to subject to excommunication, excommunicator noun
II. adjective
Date: 1521
excluded from the rights of church membership ; excommunicated, excommunicate noun