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z-axis

[zee-ak-sis] /ˈziˌæk sɪs/
noun, plural z-axes
[zee-ak-seez] /ˈziˌæk siz/ (Show IPA).
Mathematics
1.
(in a three-dimensional Cartesian coordinate system) the axis along which values of z are measured and at which both x and y equal zero.
Origin
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for z-axis

z-axis

noun
1.
a reference axis of a three-dimensional Cartesian coordinate system along which the z-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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z-axis in Science
z-axis
  (zē'āk'sĭs)   
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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