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A regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant, or resulting when a cone is cut by an oblique plane which does not intersect the base.

*‘For example he shows how to deform a circle into an ellipse and proves other results on deforming conic sections.’**‘There are three non-degenerate conics: the ellipse, the parabola, and the hyperbola.’**‘The first law states that the orbit of a satellite is an ellipse, and that one of the foci of the ellipse must be located at the centre of the Earth.’**‘If the optical component to be machined is a mirror, and the object to be imaged with that mirror is located at a finite distance, the shape will be an ellipse.’**‘It was shaped a bit oblong, like an ellipse with a very large major axis, almost to the point of not being a cigar.’**‘Here we examine this in detail, first looking at the case of a circular toroid deformed into an ellipse.’**‘The direction in which it spins, and the size and shape of the ellipse, give me information about the strength and quality of the energy in that area.’**‘Then it is shown that the displacement vector lies in a plane, and if the base point is translated to the origin, the endpoint traces out an ellipse.’**‘In contrast, an oval or an ellipse is longer than it is wide.’**‘Well, he discovered, in the elliptical function, that the Sun was located at one of the two foci of the relevant ellipse.’**‘An ellipse has two foci, i.e. two centres, unlike the circle that has just one.’**‘Principal components of the matrix were calculated and used to orient the ellipse in the plane.’**‘The rate at which a planet sweeps out area within its orbital ellipse is constant.’**‘Over the course of a year the changing position of the star traced out a small ellipse.’**‘Additional liturgical areas are designed as concave spaces bulging the ellipse outwardly.’**‘But I could explain the discrepancy if the orbit were an ellipse rather than a circle.’**‘To imagine their form, picture an ellipse levitating up from the floor, turning as it rises.’**‘The orbit of the Earth is an ellipse, not a circle, so different quarters of the orbit take different lengths of time to complete.’**‘An additional complication is that the Earth's orbit is not quite an exact circle, but an ellipse.’**‘He described the construction of an ellipse with a string fixed at the two foci.’*

**Origin**

Late 17th century via French from Latin ellipsis (see ellipsis).

**Pronunciation**

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