Nation-state (noun)

A sovereign political entity comprising of a particular nation or people that have a government and territory of their own and are independent of outside rule.

Origin:

From nation + state.

Examples:

1. The nation-state is the most common form of political organization in the world today.
2. The European Union is an unusual example of a supranational organization that has developed in parallel to the nation-state.
3. The nation-state system has been the foundation of international relations for centuries.
4. Nation-state is a political entity that possesses sovereignty and has a well-defined territory and population.
5. The United Nations is an international organization comprising of nation-states.