bright·​ness ˈbrīt-nəs How to pronounce brightness (audio)
: the quality or state of being bright
also : an instance of such a quality or state
: the attribute of light-source colors by which emitted light is ordered continuously from light to dark in correlation with its intensity compare hue sense 2c, lightness entry 1 sense 2a, saturation sense 4

Examples of brightness in a Sentence

the brightness of the sunshine made me squint after an afternoon spent in a darkened movie theater
Recent Examples on the Web The monitor also automatically adjusts brightness on static images to help prevent burn-in. Zackery Cuevas, PCMAG, 4 June 2024 The monitor also detects and automatically reduces the brightness of static images like taskbars or heads-up displays in games. Jess Weatherbed, The Verge, 4 June 2024 If the microwaves were unpolarized, then the brightness of the microwaves would remain constant. Kenneth Chang, New York Times, 3 June 2024 Wavelengths of light collected by Webb’s Mid-Infrared Instrument (MIRI) indicated the brightness of the source was above what would be extrapolated from the measurements of other instruments on the telescope, suggesting the presence of ionized gas emission from hydrogen and oxygen. Greg Wehner, Fox News, 31 May 2024 See all Example Sentences for brightness 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'brightness.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

before the 12th century, in the meaning defined at sense 1a

Time Traveler
The first known use of brightness was before the 12th century

Dictionary Entries Near brightness

Cite this Entry

“Brightness.” Dictionary, Merriam-Webster, Accessed 18 Jun. 2024.

Medical Definition


bright·​ness ˈbrīt-nəs How to pronounce brightness (audio)
: the one of the three psychological dimensions of color perception by which visual stimuli are ordered continuously from light to dark and which is correlated with light intensity compare hue, saturation sense 4a

More from Merriam-Webster on brightness

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