Super-imperialism is a Marxist term with two possible meanings. It refers either to the hegemony of an imperialist great power over its weaker rivals who then are called sub-imperialisms, or to a comprehensive supra-structure above a set of theoretically equal-righted imperialist states. The latter meaning is the older one and had become rare by the middle of the 20th century.
The expression super-imperialism first appeared in November 1914 as an inaccurate translation of the newly coined German term Ultra-Imperialismus. William E. Bohn, the translator of Karl Kautsky’s article "Der Imperialismus" ("The Imperialism"), seemed to believe that the terms Kartell and Ultra-Imperialismus were not reasonable for the audience of the International Socialist Review, an American Marxist journal. Bohn faced a double problem as cartels were much less familiar in the United States than the concern-like, tauter organized trust entities and the word ultra, which in English means "exaggerated" or "extreme". Thus, he paraphrased Kautsky’s ideas in terms more familiar to American readers, somewhat distorting Kautsky's statement.
Together with the revival of the imperialism debates in the 1970s, the term super-imperialism recovered, but was modified in its content. It served now to describe the domination by the super-power United States within a system of imperialism in which the other imperialist powers were set back in their abilities and thus were second-class. Since the same time, the German term Ultraimperialismus was translated into English literally with ultra-imperialism and was now used to describe a rather equal-righted inter-imperialist cooperation.