Definition of conic section
1
: a plane curve, line, pair of intersecting lines, or point that is the intersection of or bounds the intersection of a plane and a cone with two nappes
2
: a curve generated by a point which always moves so that the ratio of its distance from a fixed point to its distance from a fixed line is constant
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MerriamWebster unabridged
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Time Traveler for conic section
The first known use of conic section was in 1664
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