From Webster’s 1828

7. civil death, in law, is that which cuts off a man from civil society, or its rights and benefits, as banishment, outlawry, excommunication, entering into a monastery, etc., as distinguished from natural death.

8. civil law, in a general sense, the law of a state, city or country; but in an appropriate sense, the Roman empire, comprised in the Institutes, Code and Digest of Justinian and the Novel Constitutions.