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LUMEN

Definition:

1. [noun] 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
   Synonyms: lm
   
   
2. [noun] a cavity or passage in a tubular organ; "the lumen of the intestine"
   
   

Synonyms:

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