Definition of capitalist imperialism in US English:

capitalist imperialism

noun

  • Advocacy of or support for imperialism by capitalists (typically presented by communist writers as a natural consequence of the capitalist system); (later also more generally) the extension and maintenance of a capitalist country's power or influence over other countries, often those with less well-developed industrial and economic infrastructures.

Origin

Early 20th century; earliest use found in The Westminster Review.