You are multidimensional when you have become an intergalactic being. You can, at will, nano-travel these dimensions at will, while still having a body on a planet somewhere.

Multidimensional (definition #1). You are multidimensional when you have become an intergalactic being. You have evolved enough to understand the structure of the universe and that it consists of a vast amount of dimensions and you have learned how to access them from the dimension you are in! 

You can, at will, nano-travel these dimensions at will, while still having a body on a planet somewhere. You can fragment your Fire and send the fragments out on missions anywhere in the universe.