Definition of candela
: the base unit of luminous intensity in the International System of Units that is equal to the luminous intensity in a given direction of a source which emits monochromatic radiation of frequency 540 × 1012 hertz and has a radiant intensity in that direction of ¹/₆₈₃ watt per unit solid angle
—abbreviation cd
— called also candle
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Merriam-Webster unabridged
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Time Traveler for candela
The first known use of candela was in 1949
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