x-axis

X-axis is a horizontal axis.

(noun)

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

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See x-axis in Webster's New World College Dictionary

noun pl. x-axes

  1. the horizontal, or more nearly horizontal, axis in a plane Cartesian coordinate system, along which the abscissa is measured
  2. a similar axis that is perpendicular to the y-axis and the z-axis of a three-dimensional Cartesian coordinate system

See x-axis in American Heritage Dictionary 4

noun pl. x-ax·es (-ăkˌsēz)
  1. The horizontal axis of a two-dimensional Cartesian coordinate system.
  2. One of three axes in a three-dimensional Cartesian coordinate system.

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