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diopter

n.
1.a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters

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    Idiom of the Day

    go through (someone)
    to have contact with someone (often to get permission or approval from someone with power or authority)
    Everybody has to go through the accountant to get money for his or her expenses.



    1.
    tolerant

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