What does it mean to be 5th dimensional?

5th dimensional probably.

Okay. A point has no dimension. A line has one dimension: lenght A plain has two dimensions: length and width A corpus has three dimensions: length width and height Sometimes people claim that the fourth dimension is “time”. The fifth dimension does not exist in reality.

Higher mathematics calculates with more than three dimensions. For ecample a mathematical matrix or a vector can be “In a 17th dimensional space”. No human can actually imagine how that would look. But you can calculate it.