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 (rā′dē-əns) also ra·di·an·cy (-ən-sē)
1. The quality or state of being radiant.
2. Physics The radiant energy emitted per unit time in a specified direction by a unit area of an emitting surface.


(ˈreɪdɪəns) or


n, pl -ances or -ancies
1. the quality or state of being radiant
2. (Units) a measure of the amount of electromagnetic radiation leaving or arriving at a point on a surface. It is the radiant intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction. Symbol: Le


(ˈreɪ di əns)

also ra′di•an•cy,

1. radiant brightness or light.
2. warm, cheerful brightness.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.radiance - the amount of electromagnetic radiation leaving or arriving at a point on a surfaceradiance - the amount of electromagnetic radiation leaving or arriving at a point on a surface
aureole, corona - the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse
light, visible light, visible radiation - (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window"
2.radiance - the quality of being bright and sending out rays of lightradiance - the quality of being bright and sending out rays of light
brightness - the location of a visual perception along a continuum from black to white
gleam, lambency, gleaming, glow - an appearance of reflected light
sheen, shininess, luster, lustre - the visual property of something that shines with reflected light
burnish, glossiness, polish, gloss - the property of being smooth and shiny
3.radiance - an attractive combination of good health and happiness; "the radiance of her countenance"
happiness, felicity - state of well-being characterized by emotions ranging from contentment to intense joy
good health, healthiness - the state of being vigorous and free from bodily or mental disease


1. happiness, delight, pleasure, joy, warmth, rapture, elation, gaiety There was a new radiance about her.
2. brightness, light, shine, glow, glitter, glare, gleam, brilliance, lustre, luminosity, incandescence, resplendence, effulgence The dim bulb cast a soft radiance over his face.


Exceptional brightness and clarity, as of a cut and polished stone:
بَريق، لَمَعان، إشْعاع
ljómi, útgeislun
neşe/mutluluk saçma


[ˈreɪdɪəns] N
1. (= glow) [of face, personality, beauty] → lo radiante
2. (liter) (= brightness) [of sun, colour, light] → resplandor m
3. (Phys) → radiancia m


[ˈreɪdiəns] n
[face, person] → éclat m
[sunset] → lumière f; [light] → éclat m


n (of sun, smile)Strahlen nt; (of colours also)Leuchten nt


[ˈreɪdɪəns] n (brilliance) → splendore m, fulgore m (fig) → radiosità


(ˈreidiənt) adjective
1. showing great joy. a radiant smile.
2. sending out rays of heat, light etc or carried, sent etc in the form of, or by means of, rays of heat, light etc.
ˈradiantly adverb
ˈradiance noun
the radiance of her smile.
References in periodicals archive ?
In recent years, Al Qadiri has experimented with a type of nacreous spectral radiance across different media, a visual and material effect that links pearls to oil, the region's two major sources of wealth in the twentieth century.
The difference between the two FWHMs may be slight at most time, but when in spectroradiometry applications, the effective FWHM acts more in deriving the exact spectral radiance intensity.
Many researches on radiation balance with Landsat 5 and 7 images have used maximum (Lmax) and minimum (Lmin) radiances in the process of conversion of the gray level into spectral radiance (Bastiaanssen et al.
The ISS-17-VA integrating sphere source calibration standard for spectral radiance and luminance offers a variable light-intensity output while maintaining a constant color temperature.
The spectral radiance from the large sphere is shown in comparison with QM-95 in the bottom part of Fig.
One approach is SEBAL (Surface Energy Balance Algorithm for Land), which combines spectral radiance readings from satellite-based sensors with actual meteorological data to calculate the energy balance at the earth's surface.
He describes spectroscopic principles from the perspectives of classical electromagnetic theory and quantum mechanical theory, spectroscopy from the standpoint of measured spectral properties, remotely sensed spectral radiance, and imaging system, dispersive spectrometer, and Fourier transform spectrometer design and analysis, as well as additional designs, imaging spectrometer calibration, atmospheric compensation, spectral data models, and hyperspectral image classification and target detection.
Spectrally selective coatings and associated methods for minimising the effects of lighting strikes (discloses a method for reducing structural damage to a substrate resulting from interaction between the substrate and a plasma, the method including the steps of identifying a wavelength at which a spectral radiance of the plasma is at a peak, the wavelength being a function of a temperature of the plasma, preparing a coating capable of imparting to the substrate a threshold electromagnetic reflectivity over a spectral band about the wavelength, and applying the coating to the substrate.
For an ETM+ image, thermal band image data calibration is performed in a two-step process as proposed by the Landsat Project Science Office (2002): (a) conversion of the digital number (DN) values of band 6 into the spectral radiance (L) ([Wm.
Solar spectrum above the Earth's atmosphere is calculated on the basis of the Planck's law as an absolute black body spectral radiance of electromagnetic radiation at all wavelengths I ([lambda],T)
The coordinates of the points in n-space consists of "n" values that are simply the spectral radiance or reflectance values in each band for a given pixel.
For UV radiance calibration and Lambertian solar simulation, the company's XTH Uniform Source Systems generate a uniform radiance field which approximates the spectral radiance of a 100% Albedo source, or the spectral curve of the ASTM Standard D65.

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