Coterminous: An obscure term from Dungeons and Dragons Third Edition. It applies to interdimensional travel, and is the adjective to describe two planes of existence that have a portal allowing travel in-between. Another way to think of this is to use the example of two adjoining rooms. There is a doorway between them alowing you to go from the end of one, to the start of the other.
For example- To get from the Plane of Fire to the Plane of Earth, there is a single portal that has a gate on Mt. Mansiuis (on the Fire plane) and a gate in the Terran Transport Post (on the Earth Plane). They are therefore considered coterminous, because there is a form of travel that links them together.
Synonyms: Coexistant, linked, entangled, tied, connected, interwoven.
Antonyms: Opposed, distant, self-contained.
Use In Conversation: (kind of odd, but if you do need to use it...)
- Dungeon Master: You walk through the gate on the Plane of Water, and appear on the Plane of Air, near the city of Agralia.
- Player: So the Plane of Air and the Plane of Water are coterminous in this campaign?
- DM: Yes.
- Player: Are they coterminous in any other places, other than this portal we just traversed?
- DM: Maybe, maybe not. You have some exploring to do....
For more, see the Manual of the Planes node.