Meaning of Cartesian coordinates

Carte'sian coor'dinates

Pronunciation: [key]
— Math. Math.
  1. a system of coordinates for locating a point on a planeby its distance from each of two intersecting lines, or in space by its distance from each of three planes intersecting at a point.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.