IMPERIALISM
imperialism
(noun) any instance of aggressive extension of authority
imperialism
(noun) a political orientation that advocates imperial interests
imperialism
(noun) a policy of extending your rule over foreign countries
Source: WordNet® 3.1
Etymology
Noun
imperialism (countable and uncountable, plural imperialisms)
The policy of forcefully extending a nation's authority by territorial gain or by the establishment of economic and political dominance over other nations.
Source: Wiktionary
Im*pe"ri*al*ism, n.
Definition: The power or character of an emperor; imperial authority; the
spirit of empire.
Roman imperialism had divided the world. C. H. Pearson.
Source: Webster’s Unabridged Dictionary 1913 Edition