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interventionism

[in-ter-ven-shuh-niz-uh m]
noun
  1. the policy or doctrine of intervening, especially government interference in the affairs of another state or in domestic economic affairs.
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Origin of interventionism

First recorded in 1920–25; intervention + -ism
Related formsin·ter·ven·tion·ist, noun, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for interventionism

n.

1923, from intervention + -ism. Interventionist, as a noun, is recorded from 1839.

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Online Etymology Dictionary, © 2010 Douglas Harper