x-axis

[eks-ak-sis]

noun

Mathematics.

plural

x-axes 

1. Also called axis of abscissas. (in a plane Cartesian coordinate system) the axis, usually horizontal, along which the abscissa is measured and from which the ordinate is measured.

2. (in a three-dimensional Cartesian coordinate system) the axis along which values of x are measured and at which both y and z equal zero.

x-axis

noun

1. a reference axis, usually horizontal, of a graph or two- or three-dimensional Cartesian coordinate system along which the x- coordinate is measured

x-axis

1. The horizontal axis of a two-dimensional Cartesian coordinate system.

2. One of the three axes of a three-dimensional Cartesian coordinate system.

Word History and Origins

Origin of x-axis¹

First recorded in 1925–30