a policy of expansion, as of territory or currency: the colonial expansionism of Europe in the 19th century.

1895–1900; expansion + -ism

expansionist, noun, adjective
expansionistic, adjective
antiexpansionism, noun
antiexpansionist, noun, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expansionism (ɪkˈspænʃəˌnɪzəm)
the doctrine or practice of expanding the economy or territory of a country
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"one who advocates the expansion of the territory of his nation," 1862, from expansion + -ist. Related: Expansionism.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Mutual recognition is a major step toward cementing real peace in the region, as it could prevent any new expansionist wars.
It takes but one match to start a fire, only one expansionist civilization to begin colonizing the universe.
Our long and twilight struggle against that expansionist adversary has ended.
Nowadays, the town is much quieter than those heady expansionist days.
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