x-axis

[eks-ak-sis] /ˈɛksˌæk sɪs/
noun, plural x-axes
[eks-ak-seez] /ˈɛksˌæk siz/ (Show IPA). Mathematics
1.
Also called axis of abscissas. (in a plane Cartesian coordinate system) the axis, usually horizontal, along which the abscissa is measured and from which the ordinate is measured.
2.
(in a three-dimensional Cartesian coordinate system) the axis along which values of x are measured and at which both y and z equal zero.
Origin
1925-30
Can be confused
x-axis, y-axis.
Examples from the web for x-axis
  • The x-axis shows the number of months since the end of the recession.
  • In the plot to the right on the x-axis you have the combined value of math and verbal scores in standard deviation units.
British Dictionary definitions for x-axis

x-axis

noun
1.
a reference axis, usually horizontal, of a graph or two- or three-dimensional Cartesian coordinate system along which the x-coordinate is measured
x-axis in Science
x-axis
  (ěks'āk'sĭs)   

  1. The horizontal axis of a two-dimensional Cartesian coordinate system.

  2. One of the three axes of a three-dimensional Cartesian coordinate system.