luminosity

noun lu·mi·nos·i·ty \ ˌlü-mə-ˈnä-sə-tē \

Definition of luminosity

plural luminosities
1 a :the quality or state of being luminous
b :something luminous
2 a :the relative quantity of light
b :relative brightness of something
3 :the relative quantity of radiation emitted by a celestial source (such as a star)

Examples of luminosity in a Sentence

  1. the luminosity of the fireflies made for an enchanting nighttime show

Recent Examples of luminosity from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'luminosity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of luminosity

1634


Medical Dictionary

luminosity

noun lu·mi·nos·i·ty \ ˌlü-mə-ˈnäs-ət-ē \

medical Definition of luminosity

plural luminosities
1 :the quality or state of being luminous
2 a :the relative quantity of light
b :the comparative degree to which light of a given wavelength induces the sensation of brightness when perceived


Seen and Heard

What made you want to look up luminosity? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

pleasing or sweet sound

Get Word of the Day daily email!

Test Your Vocabulary

Forms of Government Quiz

  • knupfer-painting-solon-before-croesus
  • A gerontocracy is rule by:
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!