The chief public representative of a nation having duties, privileges and responsibilities varying greatly depending on the constitutional rules; a monarch in a monarchy, and often styled president in a republic, but variations such as collegiality exist.

(physics) Having or relating to the physical properties of solid materials, especially electromagnetic, thermodynamic or structural properties of crystalline solids.

(sciences) Any of the different phases of matter whose properties are dependent on the motions and forces of the molecules of which they are composed.

A political entity whose political status is less than that of a fully sovereign nation-state, as with the former Congo Free State and the former Irish Free State.

plural of free state

Characteristic of a steady state

(physics) Any state that does not change over time, or is in a dynamic equilibrium

plural of chief of state

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

A social system in which the state takes overall responsibility for the welfare of its citizens, providing health care, education, unemployment compensation and social security.