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1. The state or quality of being bright.
2. The effect or sensation by means of which an observer is able to distinguish differences in luminance.
3. The dimension of a color that represents its similarity to one of a series of achromatic colors ranging from very dim (dark) to very bright (dazzling).


1. the condition of being bright
2. (General Physics) physics a former name for luminosity4
3. (Psychology) psychol the experienced intensity of light


(ˈbraɪt nɪs)

1. the quality of being bright.
2. the luminance of a body that an observer uses to determine the comparative luminance of another body.
[before 950]




  1. Blazing like the windows of the city —James Dickey
  2. (He possessed a brainful of information,) bright and beautiful as diamonds swaddled in midnight-blue velvet —W. P. Kinsella
  3. Bright and light as the crest of a peacock —Alfred, Lord Tennyson
  4. Bright and pleasing as a child’s rattle —Virginia Woolf
  5. Bright as a beach in the moonlight —Alfred Austin
  6. (An image came to me across the years,) bright as a coin from the mint —Norman Mailer
  7. Bright as a frog’s eyes —Hart Crane
  8. Bright as all between cloudless skies and windless streams —Percy Bysshe Shelley
  9. Bright as a nettle rash —Diane Ackerman
  10. (Laugh … ) bright as a new ensign’s buttons —Frederic Wakeman
  11. Bright as a newly painted toy —Hugh Walpole
  12. Bright as an icon —Margaret Atwood
  13. Bright as any glass —Geoffrey Chaucer
  14. Bright as any meteor ever bred by the North Pole —Lord Byron
  15. Bright as a parakeet —Dame Edith Sitwell
  16. (Every day) bright as a postcard —Karl Shapiro
  17. Bright as a roomful of chrystal chandeliers —Anon
  18. Bright as a splinter from a glazier’s table —Beryl Markham
  19. (A face) bright as a waterdrop —Padraic Fallon
  20. Bright as day —Geoffrey Chaucer
  21. Bright as foil —Molly Giles
  22. Bright as freedom —Marge Piercy
  23. Bright as joy —Hartley Coleridge
  24. Bright as light —Alfred, Lord Tennyson
  25. Bright as moonlight over snow —Wallace Stegner
  26. Bright as Spring —Walter Savage Landor
  27. (Eyes as) bright as the Dipper —Stephen Vincent Benét
  28. Bright as the fullest moon in blackest air —Arabian Nights
  29. Bright as the promises of a new administration —Elyse Sommer
  30. Bright as the promise of life on commencement day —Elyse Sommer
  31. Bright as the promise of a cloudless day —C. P. Wilson
  32. Bright as the raindrops and roses in June —Dame Edith Sitwell
  33. Bright as the world was in its infant years —John Banks
  34. Bright as truth —Barry Cornwall
  35. Bright like a brimming bowl of jewels —Peter De Vries
  36. Bright, like a flash of sunlight —Edward Bulwer-Lytton
  37. Bright (eyes) like agate —D. H. Lawrence
  38. Bright like blood —Algernon Charles Swinburne
  39. Brightness … bright as dipper —Stephen Vincent Benet
  40. Brilliant as a postage stamp —Lawrence Durrell
  41. (Eyes) brilliant as fire —Nadine Gordimer
  42. [Oranges and grapefruits] brilliant as planets —Cynthia Ozick
  43. Brilliant as the stars —Ouida
  44. Brilliant as the sun —Slogan, Lustberg-Nast, Lustray shirts
  45. Brilliant like a Chinese porcelain —W. Somerset Maugham
  46. Brilliantly, gaudily colored as a Gypsy camp —Kate Simon
  47. Dazzled the eyes like a second noonday sun —Edna Ferber
  48. Growing brighter and brighter like a forest after a rain —Denis Johnson
  49. Lights up like a Star Wars pinball machine —Marge Piercy
  50. [Face] light up like a bonfire of joy —Carl Sandburg
  51. Vivid as sun through a thin brown bottle —Reynolds Price
  52. Vivid as the granules of paint in a Dubuffet —John Updike
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.brightness - the location of a visual perception along a continuum from black to white
lightness, light - the visual effect of illumination on objects or scenes as created in pictures; "he could paint the lightest light and the darkest dark"
brilliance, glare, blaze - a light within the field of vision that is brighter than the brightness to which the eyes are adapted; "a glare of sunlight"
dazzle - brightness enough to blind partially and temporarily
glisten, glister, glitter, sparkle, scintillation - the quality of shining with a bright reflected light
flash - a momentary brightness
glint - a spatially localized brightness
iridescence, opalescence - the visual property of something having a milky brightness and a play of colors from the surface
radiancy, refulgence, refulgency, shine, effulgence, radiance - the quality of being bright and sending out rays of light
brilliancy, luster, splendor, splendour, lustre - a quality that outshines the usual
dullness - a lack of visual brightness; "the brightness of the orange sky was reflected in the dullness of the orange sea"
2.brightness - intelligence as manifested in being quick and witty
intelligence - the ability to comprehend; to understand and profit from experience
3.brightness - the quality of being luminousbrightness - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
physical property - any property used to characterize matter and energy and their interactions
illuminance, illumination - the luminous flux incident on a unit area
incandescence - light from heat
glow, luminescence - light from nonthermal sources


1. vividness, richness, intensity, brilliance, splendour, resplendence You'll be impressed with the brightness of the colors.
2. light, shine, sparkle, glare, brilliance, radiance, luminosity, incandescence, effulgence, refulgence An astronomer can determine the brightness of each star.
light dullness, dimness
3. intelligence, intellect, brains (informal), awareness, sharpness, alertness, cleverness, quickness, acuity, brain power, smarts (slang, chiefly U.S.), smartness Her brightness seemed quite intimidating to me.
لَمَعان، إشْراق، سُطوع
ljómi, birta


A. N
1. [of light, sun, fire, eyes, metal] → brillo m, resplandor m; [of morning, day] → claridad f, luminosidad f; [of colour] → viveza f
2. (= cheerfulness) → alegría f, animación f
3. (= cleverness) → inteligencia f
4. (= promise) [of future, prospects] → lo prometedor
B. CPD brightness control N (TV) → botón m de ajuste del brillo


[ˈbraɪtnɪs] n
[colour] → éclat m
[star] → luminosité f
[light] → intensité fbright spark npetit(e) futé(e) m/f


(of light, fire)Helligkeit f; (of colour)Leuchten nt; (of sunshine, star also, eyes, gem)Strahlen nt; (of day, weather)Heiterkeit f; (of reflection)Stärke f; (of metal)Glanz m; brightness controlHelligkeitsregler m
(= cheerfulness: of person, smile) → Fröhlichkeit f, → Heiterkeit f
(= intelligence, of person) → Intelligenz f; (of child)Aufgewecktheit f
(of prospects)Freundlichkeit f; the brightness of the futuredie glänzende Zukunft


[ˈbraɪtnɪs] n (of room) → luminosità; (of eyes, star) → lucentezza; (of sunshine) → splendore m; (of flame, colour) → vivacità


(brait) adjective
1. shining with much light. bright sunshine.
2. (of a colour) strong and bold. a bright red car.
3. cheerful. a bright smile.
4. clever. bright children.
ˈbrightly adverb
ˈbrightness noun
ˈbrighten verb
(often with up) to make or become bright or brighter. The new wallpaper brightens up the room.
References in periodicals archive ?
Picture in your mind two deep-sky objects: They're totally different types, completely unrelated, similar in angular size and apparent brightness, and visible in a single telescopic field of view.
In the absence of gas and dust, a candle's apparent brightness should decrease in relation to its distance from Earth.
The hole though the erector tube becomes the choke point for light and the limiting factor in apparent brightness. A larger main tube, say 30mm, won't pass more light than a 1-inch tube unless the erector tube diameter is also scaled up.
The primary job of any magnifying optic is to help us see detail, and image sharpness also contributes to apparent brightness, one reason larger objective lenses provide a brighter, sharper image: In wider lenses there's less edge for the amount of lens surface.
The various luminances (the apparent brightness per unit area) of the planets compared to the full Moon are shown in the table to the left.
The lights are pulsed to provide illumination only while the camera shutter is open, minimizing power consumption and apparent brightness; the lights aren't visible in daylight.
When this is combined with careful measurements of the apparent brightness, remarkably accurate distances can be determined.
Asteroids usually change in apparent brightness as they rotate.
Finally, a comparison with the apparent brightness as seen from Earth shows how far away it must be.
For most eyes, the apparent brightness of light entering at the edge of the pupil is reduced by a factor of five compared with light entering at the position of greatest efficiency.