(law) A single woman, whether unmarried, spinster, widow or divorcee.

(quantum mechanics) Any of a class of solids (such as that of helium) whose atoms or molecules undergo large zero-point motion even in the quantum ground state (at absolute zero).

(US, military, historical) An African-American soldier in the US Army, serving in one of a number of segregated units under white officers, in the period after the US Civil War up to the final racial integration of the US military, at the end of the Korean War.

A person who lives alone; a recluse or hermit.

living or being alone; solitary

The amount of incoming solar radiation per unit area, measured on the outer surface of Earth's atmosphere, in a plane perpendicular to the rays.

(astronomy) All the electromagnetic radiation and subatomic particles radiated from the Sun, especially that part that reaches the Earth

(astronomy) The upper atmosphere of the sun, only visible during a total solar eclipse

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

A semiconductor device that converts the radiant energy of sunlight into electrical energy