, in Geometry, means much the same as Generation mentioned above, being the formation of a line, surface, or solid, by the motion or flux of a point, line, or surface; as of a globe by the rotation of a semi-circle about its diameter, &c.
In the Genesis of figures, the line or surface which moves, is called the Describent; and the line round which, or according to which, the revolution or other motion is made, the Dirigent.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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