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f region

n.
1.the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission

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    Idiom of the Day

    chew out (someone) or chew (someone) out
    to scold someone roughly
    The teacher chewed out the student for talking in class.



    1.
    In ________ of the terrible weather you have come along tonight, ladies and gentlemen, and I should like to thank all four of you for coming.

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