1. the quality or state of giving off light; brightness
2. the total amount of light emitted by a star or other celestial body
Usage: astronomy

Examples

• The luminosity of the full moon lit up the entire landscape.
• Scientists measure the luminosity of stars to determine their distance from Earth.
• The diamond’s luminosity made it sparkle brilliantly under the lights.
• The luminosity of the LED bulbs was much greater than the old incandescent ones.
• Astronomers compare the luminosity of different galaxies to study their properties.
• The luminosity of her smile brightened the whole room.