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(geometry) A closed curve, the locus of a point such that the sum of the distances from that point to two other fixed points (called the foci of the ellipse) is constant; equivalently, the conic section that is the intersection of a cone with a plane that does not intersect the base of the cone.
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.