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  1. Oxford American Dictionary

    polar coordinates

    • IPA[ˈpōlər kōˈôrdəˌnāts]
    • plural
      a pair of coordinates locating the position of a point in a plane, the first being the length of the straight line (r) connecting the point to the origin, and the second the angle (θ) made by this line with a fixed line.；the coordinates in a three-dimensional extension of this system.

    • noun: polar coordinate, plural noun: polar coordinates