x-ax·​is ˈeks-ˌak-səs How to pronounce x-axis (audio)
: 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

Examples of x-axis in a Sentence

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.

Word History

First Known Use

1886, in the meaning defined at sense 1

Time Traveler
The first known use of x-axis was in 1886

Dictionary Entries Near x-axis

Cite this Entry

“X-axis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/x-axis. Accessed 14 Jun. 2024.

Kids Definition


: the horizontal axis in a plane coordinate system along which or parallel to which abscissas are measured compare y-axis
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