Extra-mundane is an adjective that refers to something that is beyond ordinary or outside the bounds of the physical world. Some synonyms for this word include supernatural, otherworldly, transcendent, and celestial. These words highlight the mystical or divine nature of things that are extra-mundane. Other similar terms include ethereal, spiritual, and metaphysical, which all suggest an intangible quality beyond the material realm. The concept of the extra-mundane has fascinated humans for centuries and has been explored in various art forms like literature, music, and film. It represents a glimpse into a realm beyond the mundane and into the unknown mysteries of the universe.