Acadian

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Acadian is a term describing a headspace, layer, or sector where there is no day-night cycle because the very concept is inapplicable. This could be due to being underground or in space, there not being a sun and moon to cycle, or for any other reason.

Related Terms
Acadian uses the -dian suffix. Some other terms that use the same suffix are soladian, lunadian, cyclidian, and erradian.