luminosity.

1. The amount of energy a celestial object emits per unit time.

2. The visible brightness or glowing quality of a surface, image, or light.

Use it for

Words that belong together

• stellar luminosity
• high luminosity

On the page

Despite its distance, the star’s luminosity made it a useful landmark.

The flare briefly increased the dwarf star’s luminosity.

Usage notes

Primary category: sci-fi. Forms: Usually uncountable; plural: luminosities for distinct measured values. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.