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Definition of Cartesian coordinates
1. Noun. (algebraic geometry) The coordinates of a point measured as its perpendicular distance to the right of a vertical axis (the y-axis ''y''-axis) and its perpendicular distance above a horizontal axis (the x-axis ''x''-axis). ¹
2. Noun. (American English) (alternative capitalization of Cartesian coordinates) ¹
¹ Source: wiktionary.com