# axis of abscissas

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## x-axis

[eks-ak-sis]

- 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.

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## Origin of x-axis^{}

First recorded in 1925–30

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## 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

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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

## x-axis

[ĕks′ăk′sĭs]

- The horizontal axis of a two-dimensional Cartesian coordinate system.
- One of the three axes of a three-dimensional Cartesian coordinate system.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.