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: 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
Pottery Barn’s best-selling iteration is made of a high-quality, thick linen fabric that diffuses the brightness of the lightbulb while still casting a warm glow.
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Kate McGregor, Architectural Digest, 19 Sep. 2025
But as an advantage, that size fits a bigger screen rated for peak brightness of up to 3,000 outdoors.
—Prakhar Khanna, Forbes.com, 19 Sep. 2025
Also, while the 16 Plus' battery life isn’t class-leading, its 167-nit brightness at our 50% testing setting is impressive, particularly compared with the Asus and Samsung.
—Charles Jefferies, PC Magazine, 18 Sep. 2025
The wandering solar system body was later classified as a Potentially Hazardous Asteroid (PHA) owing to its size/brightness and orbit, which give it the potential to one day make a threateningly close approach to Earth.
—Anthony Wood, Space.com, 17 Sep. 2025
See All Example Sentences for brightness
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Kate McGregor, Architectural Digest, 19 Sep. 2025
But as an advantage, that size fits a bigger screen rated for peak brightness of up to 3,000 outdoors.
—Prakhar Khanna, Forbes.com, 19 Sep. 2025
Also, while the 16 Plus' battery life isn’t class-leading, its 167-nit brightness at our 50% testing setting is impressive, particularly compared with the Asus and Samsung.
—Charles Jefferies, PC Magazine, 18 Sep. 2025
The wandering solar system body was later classified as a Potentially Hazardous Asteroid (PHA) owing to its size/brightness and orbit, which give it the potential to one day make a threateningly close approach to Earth.
—Anthony Wood, Space.com, 17 Sep. 2025
See All Example Sentences for brightness
Cite this Entry
“Brightness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brightness. Accessed 22 Sep. 2025.
Copy CitationMedical Definition
brightness
noun
bright·ness
ˈbrīt-nəs 
: 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
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