brightness

bright·ness  (brtns)

n.

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).

Thesaurus

Noun	1.	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 cleverness, smartness intelligence - the ability to comprehend; to understand and profit from experience
	3.	brightness - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun" brightness level, luminance, luminosity, luminousness, light 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

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brightness

noun 1. vividness, intensity, brilliance, splendour, resplendence

noun 2. (Informal) intelligence, intellect, brains (informal) awareness, sharpness, alertness, cleverness, quickness, acuity, brain power, smarts (slang), chiefly U.S. smartness