noun

The y-axis is the vertical axis in a graph.

An example of an y-axis is the axis that runs up and down on a graph.

## y-axis

noun

*pl.*y′-ax·es·

- the vertical, or more nearly vertical, axis in a plane Cartesian coordinate system, along which the ordinate is measured
- a similar axis that is perpendicular to the x-axis and the z-axis of a three-dimensional Cartesian coordinate system

## y-axis

noun

*pl.*

**y-ax·es,**

- The vertical axis of a two-dimensional Cartesian coordinate system.
- One of three axes in a three-dimensional Cartesian coordinate system.

## y-axis

## y-axis - Computer Definition

The vertical (V), or nearest vertical, plane on a two- or three-dimensional grid, chart, or graph in a Cartesian coordinate system. See also Cartesian coordinates, x-axis, and z-axis.

See X-Y matrix.