Meaning of "Degrees of Freedom" in control system?
Degrees of freedom (in an electrical context) is related to a motor which can move and rotate in different directions.

In principle there are the following obvious 6 degrees of freedom:


movement along x axis
movement along y axis
movement along z axis
rotation around x axis
rotation around y axis
rotation around z axis


So in principle there can be 0 to 6 degrees of freedom (0 is a bit useless).

See also Jonk's comments below about non electronic degrees of freedom, and other answers (mention more than the 'obvious' ones above).