(1):
(n.) the rate of emission of heat from a bounding surface per degree of temperature difference between the surface and surrounding substances (called by Fourier external conductivity).
(2):
(n.) Tendency to emission; comparative facility of emission, or rate at which emission takes place, as of heat from the surface of a heated body.
(3):
(n.) Tendency to emission; comparative facility of emission, or rate at which emission takes place;