Nation-state (Topical Term)

Dict. of the social sciences, 2002: (nation-state: conjoining of political institutions and collective identity in single sovereign unit)

Concise Oxford dict. of politics, 2003: (nation-state: sovereign entity dominated by a single nation; it is the primary unit in the study of international relations)

Wikipedia, Feb. 20, 2008 (Nation state: traditionally, a nation state is a specific form of state, which exists to provide a sovereign territory for a particular nation, and which derives its legitimacy from that function; political science uses the term "nation state" for most existing sovereign states, even if their political boundaries do not coincide with ethnic boundaries)