Luminosity

The total energy released by an object emitting light, (in our case, this will be a star) per unit time (usually per second). Also, the power (energy per time) of the star. This is an intrinsic quality of the star. In other words, it doesn't matter where you are (neglecting relativistic effects), a star will always have the same luminosity. For most stars, their luminosity is dependent on their mass.