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wavefront

n.
1.(physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium

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    Idiom of the Day

    out on a limb
    in a dangerous or risky position or situation, in a difficult position
    The man went out on a limb and offered his brother the job.



    1.
    The top-ranking candidates (a) / will be appointed in (b) / senior jobs in good companies. (c) / No error (d)

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