x-ax·is
| \ ˈeks-ˌak-səs
\
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Definition of x-axis
1
: the axis in a plane Cartesian coordinate system parallel to which abscissas are measured
2
: one of the three axes in a three-dimensional rectangular coordinate system
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“X-axis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/x-axis. Accessed 20 Jan. 2022.
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The first known use of x-axis was in 1886
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