The vertical axis of a two-dimensional plot in Cartesian coordinates. Physicists and astronomers sometimes call this axis the ordinate,
although that term is more commonly used to refer to coordinates along the 
-axis.
y-Axis
See also
Abscissa, Ordinate, x-Axis, z-AxisExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "y-Axis." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/y-Axis.html