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lumen

n.
1.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.a cavity or passage in a tubular organ

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Word of the Day

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    Idiom of the Day

    get off to a flying start
    to have a successful beginning
    The new restaurant got off to a flying start when many people came during the first weekend.



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