Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun The vertical axis of a twodimensional Cartesian coordinate system.
 noun One of three axes in a threedimensional Cartesian coordinate system.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun algebraic geometry The axis on a
graph that is usually drawn from bottom to top and usually shows the range of values ofvariable dependent on one other variable, or the second of twoindependent variables .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun the vertical axis in a plane coordinate system
Etymologies
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Examples

Then he offers a bizarre diagram, with two axes: on the yaxis, innovation; on the xaxis, choice.
CES 2011: The Asus tablet strategy: never mind the quality, feel the width 2011

You have a horrible tendency to post charts and either not label them properly (usually the yaxis) or not state what each curve represents (in this case it happens to be fairly obvious, but you should still state it explicitly).
Matthew Yglesias » Doubts About a VehicleMiles Traveled Tax 2009

The graph itself needs to be rotated 90 degrees, so that size is indeed the xaxis and shame the yaxis, but simply switching the labels is ineffective, as it changes (and makes wrong) the meaning of the graph.
Low culture. 2010

Then, down the left side of the page (the vertical yaxis), you write all of the common issues that come up in a typical week.
How To Turn Your Creative Brainstorm Into A Completed Project  Lifehacker Australia 2010

The value on the yaxis relative to the value on the xaxis. gwjunkie Says:

It made sense to me, but that was when I read the yaxis as “how smart your parents think you are.”

The key to understanding this one is knowing that her dependent variable is on the yaxis, so Insecurity is being predicted by the independent variable on the xaxis, Products.

Here we go … the xaxis is the independent variable (price of chicken) … the yaxis is the dependent variable (squirrel population).

That missing ‘l’ made me misread the yaxis label as something related to atheism.
And swagger. 2009

I first read the yaxis as ‘authenticism’. .which of course would have more accurately been ‘authenticity’ … anyways.
And swagger. 2009
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