PARABOLA
\pəɹˈabələ], \pəɹˈabələ], \p_ə_ɹ_ˈa_b_ə_l_ə]\
Definitions of PARABOLA
 2010  New Age Dictionary Database
 1913  Webster's Revised Unabridged Dictionary
 1919  The Winston Simplified Dictionary
 1899  The american dictionary of the english language.
 1894  The Clarendon dictionary
 1919  The Concise Standard Dictionary of the English Language
 1874  Etymological and pronouncing dictionary of the English language
 1871  The Cabinet Dictionary of the English Language
Sort: Oldest first

A kind of curve; one of the conic sections formed by the intersection of the surface of a cone with a plane parallel to one of its sides. It is a curve, any point of which is equally distant from a fixed point, called the focus, and a fixed straight line, called the directrix. See Focus.

One of a group of curves defined by the equation y = axn where n is a positive whole number or a positive fraction. For the cubical parabola n = 3; for the semicubical parabola n = /. See under Cubical, and Semicubical. The parabolas have infinite branches, but no rectilineal asymptotes.
By Oddity Software

A kind of curve; one of the conic sections formed by the intersection of the surface of a cone with a plane parallel to one of its sides. It is a curve, any point of which is equally distant from a fixed point, called the focus, and a fixed straight line, called the directrix. See Focus.

One of a group of curves defined by the equation y = axn where n is a positive whole number or a positive fraction. For the cubical parabola n = 3; for the semicubical parabola n = /. See under Cubical, and Semicubical. The parabolas have infinite branches, but no rectilineal asymptotes.
By Noah Webster.

One of the conic sections formed by the intersection of the cone with a plane parallel to a line drawn from its apex to the circumference of its base.
By William Dodge Lewis, Edgar Arthur Singer
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman

A curve formed by the cutting of a cone by a plane parallel to one of its sides; one of the conic sections.
By James Champlin Fernald