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[eks-ak-sis] /ˈɛksˌæk sɪs/
noun, plural x-axes
[eks-ak-seez] /ˈɛksˌæk siz/ (Show IPA).
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.
(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 of x-axis
Can be confused
x-axis, y-axis. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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


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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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x-axis in Science
  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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