plural axes
An axis is a line that is used as a reference for drawing a figure.^{[1]} This line can exist in two dimensional and three or more dimensional space. It can also be used as a reference for geometric reflections.
xAxis  

The xaxis is the horizontal axis on a two variable Cartesian graph. This axis is typically assigned to the input of the function being represented. This also means that the xaxis typically represents the independent variable.  
yAxis  

The yaxis is the vertical axis on a two variable Cartesian graph. The yaxis is typically assigned to the output of the function being represented. This also means that the yaxis typically represents the dependent variable. On a threevariable Cartesian system, the yaxis typically represents an independent variable.  
zAxis  

The zaxis is the third axis on a three variable Cartesian graph. The zaxis is typically assigned to the output of the function being graphed. This also means that it shows the dependent variable.  
Axis of Symmetry  

An axis of symmetry is the line around which a curve is symmetrical.^{[4]} For parabolas this is a line which passes through the vertex (see figure 6). Functions and their inverses can also be drawn using the axis of symmetry, which is the line with the equation y = x (see figure 7).  
Real Axis  

In the complex plane, the real axis, on which real numbers are represented, is the horizontal axis.^{[3]}  
Imaginary Axis  

In the complex plane, the imaginary axis, on which imaginary numbers are represented, is the vertical axis.^{[3]}  
Axis of Rotation  

An axis of rotation is a line about which a geometric object rotates.^{[5]} The earth is an example of a rotating sphere. The line from the north pole to the south pole is the axis of rotation as show in figure 10. The earth spins, or rotates, about the axis of rotation. 
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