This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A military action consisting of armed forces of one geopolitical entity entering territory controlled by another such entity, generally with the objective of intervention for the purpose of preventing or ameliorating an ill.

"Less than two weeks into the U.S. "intervasion" of Haiti, a hastily conceived plan that called for cooperation between Haitian security forces and U.S. troops was a shambles."