y-axis

[wahy-ak-sis]

y-ax·is

[wahy-ak-sis]
noun, plural y-ax·es [wahy-ak-seez] . Mathematics.
1.
Also called axis of ordinates. (in a plane Cartesian coordinate system) the axis, usually vertical, along which the ordinate is measured and from which the abscissa is measured.
2.
(in a three-dimensional Cartesian coordinate system) the axis along which values of y are measured and at which both x and z equal zero.

Origin:
1925–30

x-axis, y-axis.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Y-axis is always a great word to know.
So is perfect number. Does it mean:
a positive number that is equal to the sum of all positive integers that are submultiples of it, as 6, which is equal to the sum of 1, 2, and 3
the amount by which one quantity is greater or less than another
Collins
World English Dictionary
y-axis
 
n
a reference axis, usually vertical, of a graph or two- or three-dimensional Cartesian coordinate system along which the y-coordinate is measured

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
y-axis   (wī'āk'sĭs)  Pronunciation Key 
  1. The vertical 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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