# z-axis

z-ax·isnoun

*pl.*z′-ax·es·

Geom. in a three-dimensional Cartesian coordinate system, the axis that is perpendicular to the x-axis and the y-axis and that is used to measure or plot the values of

*z*## z-axis

noun

*pl.*

**z-ax·es,**

One of three axes in a three-dimensional Cartesian coordinate system.

## z-axis

## z-axis - Computer Definition

The third axis, usually representing depth, of a three-dimensional grid, chart, or graph in a Cartesian coordinate system. The z-axis is perpendicular to both the x-axis and y-axis and is used to plot the value of z, the third unknown in mathematics. See also Cartesian coordinates, x-axis, y-axis, and z.

The third dimension in a graphics image. The width is the x-axis and the height is the y-axis. See x-y matrix.