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Abscissa and ordinate
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==In parametric equations== In a somewhat obsolete variant usage, the abscissa of a point may also refer to any number that describes the point's location along some path, e.g. the parameter of a [[parametric equation]].<ref name="WolframAlpha">{{cite web |last1=Hedegaard |first1=Rasmus |last2=Weisstein |first2=Eric W. |title=Abscissa |work=[[MathWorld]] |url=http://mathworld.wolfram.com/Abscissa.html |access-date=14 July 2013}}</ref> Used in this way, the abscissa can be thought of as a coordinate-geometry analog to the [[Dependent and independent variables|independent variable]] in a [[mathematical model]] or experiment (with any ordinates filling a role analogous to [[Dependent and independent variables|dependent variables]]).
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