Dictionary.com
definitions

hegemonism

[hi-jem-uh-niz-uh m]
noun
  1. the policy or practice of hegemony to serve national interests.

Origin of hegemonism

First recorded in 1960–65; hegemon(y) + -ism
Related formshe·gem·o·nist, noun, adjectivehe·gem·o·nis·tic, adjectivean·ti·he·gem·o·nism, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Word Origin and History for hegemonist
n.

"one who advocates a political policy of hegemony," 1898, from hegemony + -ist.

hegemonism

n.

1965, in reference to a policy of political domination, on model of imperialism; see hegemony + -ism.

Online Etymology Dictionary, © 2010 Douglas Harper