noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The quality of being luminous. countable, uncountable
2. 2
   the quality of being luminous; emitting or reflecting light wordnet
3. 3
   The amount of light that passes through, is emitted, or is reflected from a particular area, and falls within a given solid angle. countable, uncountable
4. 4
   The luminous flux emitted in a given direction divided by the product of the projected area of the source element perpendicular to the direction and the solid angle containing that direction (i.e. luminous intensity divided by unit area), measured in stilbs or apostilbs. countable, uncountable

Synonyms

All synonyms

brightnessbrightness levellightluminosityluminosityluminousness

Example

More examples

"Due to their huge size and luminance, they easily qualify as “first magnitude” stars."

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.