World From Top, By Klaus Lerdorf

historically, the New World vs. the Old World, referring to the parts of the world colonized in the wake of the age of discovery. Now mostly used in zoology and botany, as New World monkey.
Philosophy
In philosophy, the term world has several possible meanings. In some contexts, it refers to everything that makes up reality or the physical universe. In others, it can mean have a specific ontological sense. While clarifying the concept of world has arguably always been among the basic tasks of Western philosophy, this theme appears to have been raised explicitly only at the start of the twentieth century and has been the subject of continuous debate. The question of what the world is has by no means been settled.