1 A person who, due to place of birth, naturalization, or other reasons (for example, citizenship of parents) is a member of a political community or of a civil state, such as a country or state, and is entitled to all the civil rights and protections thereof and owes allegiance to its government. See also naturalization and resident. 2 For purpose of federal diversity of citizenship lawsuits, a corporation that is incorporated or has its principal place of business in a state, or an alien gr...