Definition of 'lumen'

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1. (noun) lumen, lm a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions 2. (noun) lumen a cavity or passage in a tubular organ "the lumen of the intestine"
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"lumen." Definitions.net. STANDS4 LLC, 2008. 10 October. 2008. http://www.definitions.net/definition/lumen