Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The intersection of a right circular cone and a plane, which generates one of a group of plane curves, including the circle, ellipse, hyperbola, and parabola.
  • n. A graph of the general quadratic equation in two variables.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the four distinct shapes that are the intersections of a cone with a plane, namely the circle, ellipse, parabola and hyperbola.

from the GNU version of the Collaborative International Dictionary of English

  • adj. a curved line formed by the intersection of the surface of a right cone and a plane. The conic sections are the parabola, ellipse, and hyperbola. The right lines and the circle which result from certain positions of the plane are sometimes, though not generally included.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (geometry) a curve generated by the intersection of a plane and a circular cone

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