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radius vector

n.
1.a line connecting a satellite to the center of the body around which it is rotating
2.a line connecting a point in space to the origin of a polar coordinate system

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    Idiom of the Day

    sign on with (someone)
    to sign an agreement to work with or for someone
    My cousin has signed on with one of the largest companies in the world.



    1.
    The car, which has a top speed of 190 miles per hour, costs £100,000

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