Dimensions

What are dimensions?
Most people usually think of the word "dimension" as a synonym for "universe" but in reality they're two completely different terms which shouldn't be confused.

Our Universe is said to have 3 spatial dimensions, that means the set of coordinates matter occupies in space and in which we can move. All directions: up, down, left, and right are part of these 3 spatial dimensions. There's also a fourth dimension which is time. Time allows us to move in our 3-dimensional space. So we are able to experience 4 dimensions in our Universe.

However, other theories talk about a Multiverse which has 11 dimensions. That's the case in Tengen Toppa Gurren Lagann as it was explained by both Lordgenome and the Anti-Spiral. Many of the scientific terms used in the series show that the Multiverse in TTGL is based on the theories proposed by "M-theory" and the "Many-Worlds Interpretation".

This video explains it very well: