Do u know wat the 11th dimension is?
I’d assume it’s not much different from the 10th dimension, 9th dimension, 8th dimension, or any other dimension there might be. It’s just one more direction to move in, in physical sense. In mathematical sense, the dimension of a space is the number of coordinates needed to specify every point within it. In the 2-dimensional space, you only need 2 coordinates. In the 3-dimensional space (the one we live in), you need 3 coordinates. In the 11-dimensional space, you would need at least 11 coordinates to specify a single point. That’s all there is to it. The eleventh dimension is just one of the dimensions of space that has got eleven or more dimensions.