Meaning of coordinates
The two Elements of reference for any point on a grid Chart. One element, the Abscissa (or X), is measured by horizontal distance from a vertical perpendicular axis, while the other element, the Ordinate (or Y), is measured by vertical distance from a horizontal Baseline. Abscissas to the right of the vertical axis are positive and ordinates above the horizontal baseline are positive. The point of intersection of the axis, called the Point of Origin, has the value zero for both abscissa and ordinate. Generally, Curves relating to Estimating and economic statistics are confined to one quadrant with both abscissas and ordinates positive.
Source: http://www.sceaonline.org/prof_dev/CEBoK-Glossary.xls
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