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<*mathematics, graphics*> (After Renee Descartes, French
philosopher and mathematician) A pair of numbers, (x, y),
defining the position of a point in a two-dimensional space by
its perpendicular projection onto two axes which are at right
angles to each other. x and y are also known as the
abscissa and ordinate.

The idea can be generalised to any number of independent axes.

Compare polar coordinates.

(1997-07-08)

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