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polar coordinate

noun Mathematics.
  1. Usually polar coordinates. one of two coordinates used to locate a point in a plane by the length of its radius vector and the angle this vector makes with the polar axis (polar angle).
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Origin of polar coordinate

First recorded in 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for polar coordinates

polar coordinates

pl n
  1. a pair of coordinates for locating a point in a plane by means of the length of a radius vector, r, which pivots about the origin to establish the angle, θ, that the position of the point makes with a fixed line. Usually written (r, θ)See also Cartesian coordinates, spherical coordinates
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012