It has a defined territory
It has a government
It's an independent country.
A defining characteristic of polyphony is that the independence and equality of simultaneous melodic lines.
The defining feature of a nation-state is that it will have a constituent citizenry, a government and defined borders. A constituent citizenry also means a fixed territory in which it claims jurisdiction and sovereignty.
A.
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What was the defining characteristic of the Spartan city-state? A: Military state
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The mammary glands, a defining characteristic of mammals.
The defining characteristic of a main sequence star burns hydrogen to helium in its core.
Population, Territory, Sovereignty, and Government.
The defining characteristic of a fable is that it has talking animals.
Eukaryotes have a well defined nucleus in their cells.