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Definitions:
Noun
radius vector
Definition: a line connecting a satellite to the center of the body around which it is rotating
radius vector
Definition: a line connecting a point in space to the origin of a polar coordinate system
Definition: A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates.