Pertinent or common to the whole world: an issue of cosmopolitan import. Having constituent elements from all over the world or from many different parts of the world: the ancient and cosmopolitan societies of Syria and Egypt. So sophisticated as to be at home in all parts of the world or conversant with many spheres of interest: a cosmopolitan traveler. Ecology Growing or occurring in many parts of the world; widely distributed. A cosmopolitan person or organism; a cosmopolite.