candela

[kan-dee-luh]
noun Optics.
a basic unit of luminous intensity in the International System of Units (SI), formally defined as the luminous intensity of a source that emits monochromatic radiation of frequency 540 × 10 12 hertz and that has a radiant intensity of 1/683 watt/steradian: adopted in 1979 as the international standard of luminous intensity. Abbreviation: Cd

Origin:
1945–50; < Latin: candle

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World English Dictionary
candela (kænˈdiːlə, -ˈdeɪlə)
 
n
cd, candle, Also called: standard candle the basic SI unit of luminous intensity; the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of (1/683) watt per steradian
 
[C20: from Latin: candle]

Candela (kænˈdiːlə)
 
n
Felix. 1910--97, Mexican architect, noted for his naturalistic modern style and thin prestressed concrete roofs

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Etymonline
Word Origin & History

candela
unit of luminous intensity, 1950, from L. candela (see candle).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

candela can·del·a (kān-děl'ə)
n.
Abbr. cd
A unit of measurement of luminous flux, equal to the amount of light given out through a solid angle by a source of one candela radiating equally in all directions. Also called candle.

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American Heritage
Science Dictionary
candela  [%PREMIUM_LINK%]     (kān-děl'ə)  Pronunciation Key 
The SI unit used to measure the brightness of a source of light (its luminous intensity). By definition, one square centimeter of a blackbody at the freezing point of platinum emits one-sixtieth of a candela of radiation. See Table at measurement. See also lumen, luminous flux.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

candela

unit of luminous intensity in the International System of Units (SI), defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 1012 hertz and has a radiant intensity in that same direction of 1683 watt per steradian (unit solid angle). The candela has replaced the standard candle or lamp as a unit of luminous intensity in calculations involving artificial lighting and is sometimes called the "new candle."

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
For historical reasons, the candela is the fundamental unit of light, even though the lumen is more simply defined.
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