en.wikipedia.org/wiki/Cartesian_coordinate_system

A Cartesian coordinate system is a coordinate system that specifies each point
uniquely in a .... A plane with **x- and y**-**axes defined** is often referred to as the
Cartesian plane or **xy**-plane. The value of **x** is called the **x**-coordinate or abscissa
and ...

en.wikipedia.org/wiki/Abscissa_and_ordinate

In mathematics, an abscissa is the number whose absolute value (modulus) is
the perpendicular distance of a point from the **vertical axis**; the ordinate is the
number whose absolute value is the point's perpendicular distance from the
horizontal axis. Usually these are the horizontal and vertical coordinates of a
point in a ... to the horizontal and **vertical axes** respectively (typically **x**-axis and **y**
–**axis**) of ...

www.mathsisfun.com/definitions/x-axis.html

**X Axis**. more ... **X Axis**. The line on a graph that runs horizontally (left-right)
through zero. It is used as a reference line so you can measure from it.

www.dictionary.com/browse/y-axis

**Y**-**axis definition**, Also called axis of ordinates. ... coordinate system) the axis
along which values of y are measured and at which both **x** and z equal zero.

www.gradeamathhelp.com/x-axis-and-y-axis.html

The **x**-axis is a horizontal line and the **y**-**axis** is a vertical line. I'm sure you've
heard that a million times, but it might hard for you to remember which one is
which.

whatis.techtarget.com/definition/x-and-y-coordinates

The y coordinate is a given number of pixels along the **vertical axis** of a display
starting from the pixel (pixel 0) at the top of the screen. Together, the **x and y** ...

www.freemathhelp.com/xy-axis.html

An **x-y axis**, also known as a cartesian coordinate system or a coordinate plane,
is a two-dimensional plane of points **defined** uniquely by a pair of coordinates.

www.yourdictionary.com/y-axis

**y**-**axis definition**: The **y**-**axis** is the **vertical axis** in a graph. ... a similar axis that is
perpendicular to the **x**-axis and the z-axis of a three-dimensional Cartesian ...

www.yourdictionary.com/x-axis

**x**-axis **definition**: **X**-axis is a horizontal axis. ... a similar axis that is perpendicular
to the **y**-**axis** and the z-axis of a three-dimensional Cartesian coordinate system.