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.

(mathematics) A function whose value is the same for all the elements of its domain.

(mathematics) A characteristic of an exponential function, represented by τ in the function:

(calculus) An unspecified constant term added to a particular antiderivative to make it represent its whole family of antiderivatives, usually denoted with C.

(physics) A term added by Albert Einstein to his equations of general relativity in order to account for a supposed static universe, since used to describe vacuum energy as a form of dark energy.

(physics) A physical quantity that is generally believed to be both universal in nature and constant in time.

(physics) A characteristic of a spring which is defined as the ratio of the force affecting the spring to the displacement caused by it.

Describing a universal joint that allows constant power to be transmitted through a variable angle

A variant of hemoglobin in which a mutation in the alpha globin gene produces an alpha globin chain that is abnormally long.

(physics) the coupling constant appearing in the Einstein field equation