What does the prefix "Ultra-" signify?

The prefix "Ultra-" signifies the notion of "beyond" or "exceeding." It is derived from Latin, where it signifies excess or an extreme degree. When used in various terms, it conveys the idea of surpassing a certain limit, whether in intensity, scope, or extent. For instance, terms like "ultraviolet" refer to light waves beyond the visible spectrum, and "ultramarathon" refers to races that are longer than the standard marathon distance. This prefix illustrates concepts that go further than the normal or average, which aligns with the meaning of "beyond." Other choices do not capture this essence as accurately or comprehensively.