noun
parallel world; parallel universe
Used in science fiction, fantasy, and theoretical physics to refer to a world or universe existing alongside our own. Often interchangeable with パラレルワールド.
See also: パラレルワールド
その小説では、主人公が並行世界に迷い込む。
In that novel, the protagonist wanders into a parallel world.
Some scientists believe in the existence of parallel universes.