Someone who didn't know better might see "Ethereal Basic" and think it's just the Ethereal Human dialect of Galactic Basic Standard. Truth is, it's much more than that, and much older, too.
—A linguistic historian
Ethereal Basic, sometimes shortened to Ethereal or, specifically in the Ethereal Demesnes, Basic, was a language spoken in multiple areas of the galaxy and the Cradle, concentrated primarily in the region of the galaxy known as the Ethereal Demesnes and in the areas of the Cradle historically governed by the Ethereal Dominion. It was a deliberately-created language with limited change over the course of history, even across millennia of social evolution, however it did gain a number of dialects over time. In spite of the divergence of these dialects, communication between the dialects and the core Ethereal Basic language remained easy even as late as the Second Imperial Civil War. Ethereal Basic was, by law of the Diet of the Ethereal Demesnes, the primary official language of the Ethereal Demesnes, the Ethereal Empire, and every government within the boundaries of the region. The education of all children living in the Demesnes was mandated to include Ethereal Basic before any other language, even superseding indigenous languages, purportedly to allow for universal communication capabilities among the entire regional population.