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imperialism

im·pe·ri·al·ism (ĭm-pîr'ē-ə-lĭz'əm) pronunciation
n.
  1. The policy of extending a nation's authority by territorial acquisition or by the establishment of economic and political hegemony over other nations.
  2. The system, policies, or practices of such a government.
imperialist im·pe'ri·al·ist adj. & n.
imperialistic im·pe'ri·al·is'tic adj.
imperialistically im·pe'ri·al·is'ti·cal·ly adv.

Policy of systematic domination and exploitation of a country by another country or an empire. Marxists assert that the United States engages in imperialism because powerful U.S. Businesses need to protect their foreign markets.

US Military Dictionary
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imperialism

n.a policy of extending a country's power and influence through diplomacy or military force: the struggle against Western imperialism.

imperialistic adj. imperialistically adv.

Political Dictionary
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Domination or control by one country or group of people over others.