# Definition:Axis/X-Axis

(Redirected from Definition:X-Axis)

## Definition

In a cartesian coordinate system, the $x$-axis is the one usually depicted and visualised as going from left to right.

It consists of all the points in the real vector space in question (usually either $\R^2$ or $\R^3$) at which all the elements of its coordinates but $x$ are zero.

## Also denoted as

Some sources use an abbreviated form to denote the $x$-axis, for example: $\textsf O x$, or $X'OX$.

## Linguistic Note

The plural of axis is axes, which is pronounced ax-eez not ax-iz.

Compare basis.