Dimension

A dimension is a coordinate in reality. Thus, an n-dimensional object is one that needs at minimum n coordinates to specify a point of existence anywhere in it.

A brane is a physical object that generalizes the notion of a point particle to higher dimensions. For instance, a point particle can be viewed as a brane of dimension zero, while a string can be viewed as a brane of dimension one. The word "brane" comes from "membrane" which refers to a 2d brane. Branes such as a tesseract are used to conceptualize higher-level dimensional structures.

Pocket Dimensions (subspace child matrices) are small extra pockets of space that are attached to our own. Much like an actual pocket, they are often used for some extra space where you can get things bigger on the inside. Examples are the Bag of Holding and the TARDIS.

Reality has infinite dimensions. Anything outside reality is unbound by dimensions and is sometimes referred to as "other-realmly". This wiki prefers to have all of existence defined by realms of different levels.

Glossary: intradimensional, interdimensional, extradimensional, transdimensional, unidimensional, multidimensional, megadimensional, paradimensional, omnidimensional

It should be noted here how the megaverse can have infinite dimensions, and yet the omniverse can include the megaverse, and the hyperverse can include the omniverse. Well, there are different sizes of infinity according to set theory. Set theory of transfinite numbers, absolute numbers and the continuum hypothesis talk about higher infinities, or sets that have larger infinities than their subsets. This relates to the number of dimensions in each verse.

The universe goes up to 4d, the multiverse 6d, the megaverse 7d to 11d (which is the first subset of infinity), the omniverse 11d (which has a higher infinity but includes the subset of the megaverse), and then the hyperverse which is greater than 11d up to an infinity of dimensions, of which the omniverse is a subset.