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opacity

n.
1.the phenomenon of not permitting the passage of electromagnetic radiation
2.incomprehensibility resulting from obscurity of meaning
3.the quality of being opaque to a degree

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    Idiom of the Day

    once in a lifetime
    only happening one time in one's lifetime
    The chance to see the famous singer may happen only once in a lifetime.



    1.
    When a horse walks fairly quickly along, it ________

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