a reference axis, usually horizontal, of a graph or two- or three-dimensional Cartesian coordinate system along which the x-coordinate is measured
WordReference Random House Unabridged Dictionary of American English © 2026
x-ax•is
(eks′ak′sis),USA pronunciation n., pl. x-ax•es (eks′ak′sēz).USA pronunciation [Math.]
- MathematicsAlso 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. See diag. under abscissa.
- Mathematics(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.
- 1925–30
Collins Concise English Dictionary © HarperCollins Publishers::
'x-axis' also found in these entries (note: many are not synonyms or translations):
I, i
- Newton's method
- X, x
- abscissa
- axis
- axis of abscissas
- definite integral
- hyperbola
- inclination
- integral
- normal
- ordinate
- sine
- slope
- strophoid
- subnormal
- subtangent
- symmetrical
- tangent
- witch of Agnesi
- x