A political unit consisting of a government that has sovereignty presiding a well defined teritory.

The description you provided fits the definition of a "state" in political science. A state is a central political unit that has the following key characteristics:

1. Sovereignty: This means that the state has the ultimate authority over its territory and is not subject to any external power. It can govern itself and make its own laws.

2. Defined Territory: A state must have clear geographic boundaries. This territory is recognized both internally and externally, having a specific area that it controls.

3. Government: A state has an organized political structure that manages its affairs. This government can take various forms, including democracies, monarchies, or authoritarian regimes.

This definition is fundamental to understanding international relations and political organization, as states are the primary actors in these fields. The concept emphasizes not just the physical aspect of a territory but also the political legitimacy and recognized authority that comes with statehood.