- (in a plane Cartesian coordinate system) the axis, usually horizontal, along which the abscissa is measured and from which the ordinate is measured.
- (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.
- a reference axis, usually horizontal, of a graph or two- or three-dimensional Cartesian coordinate system along which the x- coordinate is measured
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