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.
Posthegemony
Posthegemony or post-hegemony is a period or a situation in which hegemony is no longer said to function as the organizing principle of a national or post-national social order, or of the relationships between and amongst nation states within the global order. The concept has different meanings within the fields of political theory, cultural studies, and international relations.