imperialism

n. practice of expanding the authority and power of a country by acquiring territory or dominating the economic and political systems of other countries; empire's system of government

For the computer game, see Imperialism (computer game). Imperialism is the forceful extension of a nation's authority by territorial conquest establishing economic and political domination of other nations that are not its own colonies.
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Noun
1. a policy of extending your rule over foreign countries
(hypernym) foreign policy
(hyponym) manifest destiny
2. a political orientation that advocates imperial interests
(hypernym) political orientation, ideology, political theory
3. any instance of aggressive extension of authority
(hypernym) control

(n.)
The power or character of an emperor; imperial authority; the spirit of empire.
  

imperialism