A state is a compulsory political organization with a centralized government that maintains a monopoly of the legitimate use of force within a certain territory.

States may be sovereign. Many states are federated states which participate in a federal union. Some states are subject to external sovereignty or hegemony where ultimate sovereignty lies in another state. The state can also be used to refer to the secular branches of government within a state, often as a manner of contrasting them with churches and civilian institutions (civil society).

There is no academic consensus on the most appropriate definition of the state. The term "state" refers to a set of different, but interrelated and often overlapping, theories about a certain range of political phenomena. The act of defining the term can be seen as part of an ideological conflict, because different definitions lead to different theories of state function, and as a result validate different political strategies.

The most commonly used definition is Max Weber's, which describes the state as a compulsory political organization with a centralized government that maintains a monopoly of the legitimate use of force within a certain territory. General categories of state institutions include administrative bureaucracies, legal systems, and military or religious organizations.

State commonly refers to either the present condition of a system or entity, or to a governed entity (such as a country) or sub-entity (such as a province or region).

A polity is a state or one of its subordinate civil authorities, such as a province, prefecture, county, municipality, city, or district. It is generally understood to mean a geographic area with a corresponding government. Thomas Hobbes considered bodies politic in this sense in Leviathan. In previous centuries, body politic was also understood to mean "the physical person of the sovereign" (in monarchies and despotisms, the emperor, king, or dictator, and, in republics, the electorate). Today, it may also refer to a representation of the ethnic or gender demographics of a region; for example, in many liberal democracies, cabinets are chosen to represent the body politic.^{[citation needed]}