Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. The vertical axis of a twodimensional Cartesian coordinate system.
 n. One of three axes in a threedimensional Cartesian coordinate system.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The axis on a graph that is usually drawn from bottom to top and usually shows the range of values of variable dependent on one other variable, or the second of two independent variables.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. the vertical axis in a plane coordinate system
Etymologies
Sorry, no etymologies found.
Examples

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

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.

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

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

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.

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

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

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

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

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
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