- X-axis is a horizontal axis.
An example of an x-axis is the line across the bottom of a chart.

## x-axis

noun

*pl.*x-axes

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

## x-axis

noun

*pl.*

**x-ax·es**

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

## x-axis

Noun

(*plural* x-axes)

- (algebraic geometry) The axis on a graph that is usually drawn left to right and usually shows the range of values of an independent variable.

## x-axis - Computer Definition

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

See x-y matrix.