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spherical coordinate
noun
Definition of SPHERICAL COORDINATE
: one of three coordinates that are used to locate a point in space and that comprise the radius of the sphere on which the point lies in a system of concentric spheres, the angle formed by the point, the center, and a given axis of the sphere, and the angle between the plane of the first angle and a reference plane through the given axis of the sphere
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First Known Use of SPHERICAL COORDINATE
circa 1864
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