The titular head of a nation, as a president or king.

plural of chief of state

(idiomatic) A specific situation; a set of circumstances.

The official nickname for the state of Mississippi in the United States of America.

(US) Of, pertaining to, or originating in another state / (US, not comparable) Available to individuals from another state; available to individuals not from the current or relevant state

plural of rogue state

plural of organ of state

Any of the three primary divisions of a state’s sovereignty (namely, the executive, the legislature, or the judiciary); the powers of each having been divided and balanced in accordance with the political principle of the separation of powers.

(quantum mechanics) Any state of the Fock space with a well-defined number of particles in each state.

(control engineering) A mathematical model of a physical system as a set of input, output and state variables related by first-order differential equations.