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| [[File:Cartesian-coordinate-system.svg|thumb|right|250px|Illustration of a Cartesian coordinate plane. The first value in each ordered pair is the abscissa of the corresponding point.]]In [[mathematics]], '''abscissa''' (plural '''abscissae''' or '''abscissæ''' or '''abscissas''') most often refers to the horizontal coordinate of a point in a two-dimensional rectangular [[Cartesian coordinate system]]. The term can also refer to the horizontal axis (typically ''x''-axis) of a two-dimensional graph (because that axis is used to define and measure the horizontal coordinates of points in the space). An [[ordered pair]] consists of two terms—the abscissa (horizontal, usually ''x'') and the [[ordinate]] (vertical, usually ''y'')—which define the location of a point in two-dimensional rectangular space.
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| :<math>(\overbrace{x}^\text{abscissa}, \overbrace{y}^\text{ordinate})</math>
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| ==In parametric equations==
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| 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 | last = Hedegaard | first = Rasmus | last2 = Weisstein | first2 = Eric W. | title = Abscissa | work = [http://mathworld.wolfram.com/ MathWorld]--A Wolfram Web Resource | url = http://mathworld.wolfram.com/Abscissa.html | accessdate = 14 July 2013}}</ref> Used in this way, the abscissa can be thought of as a coordinate-geometry analog to the [[Independent_variable#Independent_variable|independent variable]] in a [[mathematical model]] or experiment (with any ordinates filling a role analogous to [[Dependent and independent variables#Dependent_variable|dependent variables]]).
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| ==Examples==
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| * For the point (2, 3), 2 is called the abscissa and 3, the [[ordinate]].
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| * For the point (5, 15), 5 is called the abscissa and 15, the ordinate.
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| ==See also==
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| {{Portal|Geometry}}
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| * [[Ordinate]]
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| * [[Dependent and independent variables]]
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| * [[Function (mathematics)]]
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| * [[Relation (mathematics)]]
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| * [[Line chart]]
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| ==References==
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| <references />
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| {{FOLDOC}}
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| ==External links==
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| * {{Wiktionary-inline}}
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| [[Category:Elementary mathematics]]
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| [[Category:Coordinate systems]]
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| [[Category:Dimension]]
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| <!--[[en:Abscissa]]-->
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| [[de:Kartesisches Koordinatensystem#Das Koordinatensystem im zweidimensionalen Raum]]
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Revision as of 20:05, 12 February 2014
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