in·​va·​sion | \ in-ˈvā-zhən \

Definition of invasion 

1 : an act of invading especially : incursion of an army for conquest or plunder
2 : the incoming or spread of something usually hurtful

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Examples of invasion in a Sentence

The enemy launched an invasion. The people live under a constant threat of invasion. The town is gearing up for the annual tourist invasion. protecting the house from insect invasion
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Recent Examples on the Web

Slowly, the men understood that the peace in the early years after the U.S. invasion had only been temporary. Maija Liuhto, Longreads, "A Music So Beautiful the Birds Fell from the Trees," 28 June 2018 Buy Now Buy Now COS leather slip-on shoes The loafer invasion is happening. The Editors Of Gq, GQ, "The 13 Best New Menswear Items to Buy This Week," 22 June 2018 There’s not even a reason why the invasion is occurring. Lindsay Grace, Smithsonian, "The Original ‘Space Invaders’ is an Icon of 1970s America’s Deepest Fears," 19 June 2018 Russia's invasion and absorption of Crimea was also widely condemned by the broader international community, which further isolated Moscow. CBS News, "Trump makes misleading claims about Crimea, FBI, North Korea," 15 June 2018 There is a precision and care taken by this uncredited map maker to exactly notate where the invasion was happening while also putting it in context with England and the rest of France. Todd Stewart,, "74th anniversary of D-Day: How the Orlando Morning Sentinel covered it," 5 June 2018 As an Army nurse who helped care for thousands of Allied casualties, the invasion was the turning point of her life. Sig Christenson, San Antonio Express-News, "At 100, Army nurse looks back on D-Day," 3 June 2018 Facebook has argued that the collection of biometric data caused no real harm to the people suing, but by granting class-action status, the judge indicated that a potential invasion of privacy was harm enough to allow the case to proceed. Ally Marotti,, "Trial over Facebook lawsuit that could affect millions in Illinois postponed," 30 May 2018 The time after the American invasion was a time of great hope. Shah Marai, CNN, "The Afghan photographer who dedicated his life to documenting a country fraught with war," 30 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'invasion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of invasion

15th century, in the meaning defined at sense 1

History and Etymology for invasion

Middle English invasioune, from Anglo-French invasion, from Late Latin invasion-, invasio, from Latin invadere to invade

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Statistics for invasion

Last Updated

7 Jan 2019

Look-up Popularity

Time Traveler for invasion

The first known use of invasion was in the 15th century

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More Definitions for invasion


in·​va·​sion | \ in-ˈvā-zhən \

Kids Definition of invasion

: an act of invading


in·​va·​sion | \ in-ˈvā-zhən \

Medical Definition of invasion 

: the act of invading: as
a : the penetration of the body of a host by a microorganism
b : the spread and multiplication of a pathogenic microorganism or of malignant cells in the body of a host


in·​va·​sion | \ in-ˈvā-zhən \

Legal Definition of invasion 

: the act of or an instance of invading

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More from Merriam-Webster on invasion

Rhyming Dictionary: Words that rhyme with invasion

Thesaurus: All synonyms and antonyms for invasion

Spanish Central: Translation of invasion

Nglish: Translation of invasion for Spanish Speakers

Britannica English: Translation of invasion for Arabic Speakers

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