: the axis in a plane Cartesian coordinate system parallel to which abscissas are measured
: one of the three axes in a three-dimensional rectangular coordinate system
Recent Examples on the Web That’s because the roots of a function occur where its graph crosses the horizontal line y=0 (the x-axis), and in general, those intersections aren’t symmetric about the cubic’s special point of symmetry. —Patrick Honner, Quanta Magazine, 24 Mar. 2023
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'x-axis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Love words? Need even more definitions?Merriam-Webster unabridged
See Definitions and Examples »
Get Word of the Day daily email!
Words at Play
Palter, Dissemble, and Other Words for Lying
Skunk, Bayou, and Other Words with Native American Origins
You've used more than you might think
Words For Things You Didn't Know Have Names, Vol. 2
When 'thingamajig' and 'thingamabob' just won't do
When Were Words First Used?
Look up any year to find out
Ask the Editors