An ecclesiastical punishment inflicted upon heretics and offenders against the Church laws and violators of the moral code; was formulated in the Christian Church in the 2nd and 3rd centuries. It varied in severity according to the degree of transgression, but in its severest application involved exclusion from the Eucharist, Christian burial, and the rights and privileges of the Church; formerly it had the support of the civil authority, but is now a purely spiritual penalty.