brightness

noun

bright·​ness ˈbrīt-nəs 

1

a

: the quality or state of being bright

also : an instance of such a quality or state

b

: luminance

2

: 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

Synonyms of brightness

• brilliancy
• brilliance
• lightness
• illumination
• luminosity

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 Admiral Schley’s High Ball is a lovely and disarming drink, the bright fruit of the pineapple teasing out the honeyed brightness of the dessert wine, with the mild oak from the Irish Whiskey providing structure, a kind of a gentle but present backbone. —Jeremy Repanich, Robb Report, 14 Mar. 2026

Astronomers use magnitude to measure the brightness of objects in the night sky. —Anthony Wood, Space.com, 14 Mar. 2026

The 10a's screen offers 11% more brightness than the 9a's. —Eric Zeman, PC Magazine, 13 Mar. 2026

The sharp tanginess of the vinegar tapers off when cooked, lending subtle brightness to dishes. —Randi Gollin, Martha Stewart, 12 Mar. 2026

Word History

First Known Use

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

Rhymes for brightness

• lightness
• rightness
• tightness
• whiteness
• politeness
• uprightness

Medical 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