noun, plural y-axes [wahy-ak-seez] . Mathematics.
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. See diag. under ordinate.
(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.


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

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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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Example sentences
The first division is within the x-axis, the second within the y-axis then the
  third in the z-axis before repeating itself.
Doing so would move many of the schemes with a positive value on the y-axis
  into negative territory.
What you see on the x-axis are ages of individuals, and on the y-axis the
  expected years of life at that age.
The x-axis is the first principal component of variation, and the y-axis the
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