en.wikipedia.org/wiki/Cartesian_coordinate_system

A Cartesian coordinate system is a coordinate system that specifies each point
uniquely in a .... A plane with x- and y-**axes defined** is often referred to as the
Cartesian plane or xy-plane. .... In such a 2D diagram of a 3D coordinate system,
the **z**-**axis** would appear as a line or ray pointing down and to the left or down and
to the ...

en.wikipedia.org/wiki/Three-dimensional_space

Three-dimensional space is a geometric setting in which three values (called
parameters) are required to determine the position of an element (i.e., point). This
is the informal **meaning of** the term dimension. ... Relative to these **axes**, the
position of any point in three-dimensional space is given by an ..... \iiint \limits _{D
}f(x,y,**z**) ...

www.pcmag.com/encyclopedia/term/54951/x-y-z-matrix

A three-dimensional structure. The x-**axis** and y-**axis** represent the first two
dimensions; the **z**-**axis**, the third dimension. In a graphic image, the x and y
denote ...

www.calpoly.edu/~elovagli/HTML/concepts_01.htm

Maya (and virtually all 3-D programs) **define** virtual 3-dimensional space with a ...
In Maya, X is the **axis** that goes side to side, Y is up to down and **Z** is forward to ...

english.stackexchange.com/questions/56472/x-y-z-horizontal-vertical-and

Jan 31, 2012 **...** It says they are rarely used, but I doubt there are many other alternative terms,
other than **Z**-**axis**, depth, and so on; they're the most appropriate ...

www.dictionary.com/browse/z-axis

**Z**-**axis definition**, (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.

www.computerhope.com/jargon/z/zaxis.htm

Apr 26, 2017 **...** Computer **dictionary definition** for what **Z**-**axis** means including related links,
information, and terms.

www.lynda.com/Photoshop-tutorials/3D-explained-XYZ-position-orientation/77855/82310-4.html

Mar 29, 2011 **...** The course covers creating 3D type with Repoussé; moving, scaling, and rotating
objects along the X, Y, and **Z axes**; applying materials to ...