This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The policy or practice of intervening, especially:

n. The policy of intervening in the affairs of another sovereign state.

n. The use of government power to control or influence domestic economic activity.

n. The political practice of intervening in a sovereign state's affairs.

n. The medical practice of trying to prolong someone's life.

"And only non-interventionism is consistent with classical republicanism and small-goverment conservatism."

interventionist   

economic interventionism   

monetarist    afootwhose    goo-goo    unipolarity    oneis