Hegemony
In the 19th century, hegemony came to denote the "Social or cultural predominance or ascendancy; predominance by one group within a society or milieu". Later, it could be used to mean "a group or regime which exerts undue influence within a society". Also, it could be used for the geopolitical and the cultural predominance of one country over others, from which was derived "hegemonism", as in the idea that the Great Powers meant to establish European hegemony over Asia and Africa.
Regional hegemony
In international relations, regional hegemony is the hegemony (political, economic, or military predominance, control or influence) of one independently powerful state, known as the regional hegemon over other neighboring countries. The relationship between regional hegemons and the other states within their spheres of influence is analogous to the relationship between a global hegemon and the other states in the international system.