X-axis meaning

ĕks'ăk'sĭs
The horizontal axis of a two-dimensional Cartesian coordinate system.
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One of three axes in a three-dimensional Cartesian coordinate system.
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X-axis is a horizontal axis.

An example of an x-axis is the line across the bottom of a chart.

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The horizontal, or more nearly horizontal, axis in a plane Cartesian coordinate system, along which the abscissa is measured.
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A similar axis that is perpendicular to the y-axis and the z-axis of a three-dimensional Cartesian coordinate system.
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The horizontal axis of a two-dimensional Cartesian coordinate system.
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One of the three axes of a three-dimensional Cartesian coordinate system.
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The horizontal (H), or nearest horizontal, plane on a two- or three-dimensional grid, chart, or graph in a Cartesian coordinate system. See also Cartesian coordinates, y-axis, and z-axis.
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(algebraic geometry) The axis on a graph that is usually drawn left to right and usually shows the range of values of an independent variable.
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