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# Definition of: parabola

(pə·rab**′**ə·lə) noun Math.

The locus of a point moving in a plane so that its distances from a fixed point (focus) and a fixed straight line (directrix) are equal; the curve formed by the edges of a plane when cutting through a right circular cone at an angle parallel to one of its sides. [<Med. L <Gk. *parabolē.* Doublet of PALAVER, PARABLE, PAROLE.]