luminosity

Luminosity is the total rate of energy emission by a star or other astronomical object, often expressed in joules per second (i.e., watts) or in solar luminosities (L_Sun). Thus it is the power of the starshine. For objects shining the same in all directions (isotropically), absolute bolometric magnitude is a measure of the same thing, but expressed logarithmically. The term luminosity is also used in discussions of stellar structure to refer to the energy produced/released within an inner portion of the star, such as citing the luminosity produced within a particular radius of the center, e.g., the stellar core.

Generally when unqualified and not in a context that implies otherwise, luminosity is intended to mean bolometric luminosity, i.e., energy emitted over all wavelengths. The term may be used for a single wavelength (monochromatic luminosity) or over some wavelength range or via some passband (filter).