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

Origin of interventionism

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

Examples from the Web for interventionism

Contemporary Examples of interventionism

Word Origin and History for interventionism

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

Online Etymology Dictionary, © 2010 Douglas Harper