Dimension

A dimension is a coordinate in space. Thus, an n-dimensional object is one that needs at minimum n coordinates to specify a point anywhere in it. A dimension is the term used in the formal science to define a cosmological ontology. Dimensional can also be use in philosophy to purely abstract about ontological being.

A realm has an infinite amount of dimensions. Anything inaccessible through the concepts of dimensions is "other-realmly".

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. It is also possible to consider higher-dimensional p-branes. The word comes from "membrane" which refers to a 2d brane.

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.

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