x-axis

[eks-ak-sis]
noun, plural x-axes [eks-ak-seez] . 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. See diag. under abscissa.
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

x-axis, y-axis.
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Collins
World English Dictionary
x-axis
 
n
a reference axis, usually horizontal, of a graph or two- or three-dimensional Cartesian coordinate system along which the x-coordinate is measured

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
x-axis   (ěks'āk'sĭs)  Pronunciation Key 
  1. The horizontal axis of a two-dimensional Cartesian coordinate system.

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


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The x axis is the first dimension, and the y the second.
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