in·​va·​sion | \ in-ˈvā-zhən How to pronounce invasion (audio) \

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 The presenting issue was military: the threat of a French invasion loomed—which is why mapping began in the country’s southeast. Alan Jacobs, Harper's Magazine, 12 Oct. 2021 Incredibly, that is the official advice for lanternfly control being handed out by experts across the lanternfly-invasion zone. Leanne Potts, Better Homes & Gardens, 4 Oct. 2021 Melania Trump was represented in both cases by attorney Charles Harder, who represented professional wrestler Hulk Hogan in his invasion-of-privacy suit against Gawker Media. Washington Post, 22 Sep. 2021 Fortnite is about to end the alien invasion, one way or another, with an event called Sky Fire, which takes place this Saturday. Paul Tassi, Forbes, 10 Sep. 2021 Short of another invasion, who is going to hold them to that? Lisa Selin Davis, CNN, 4 Sep. 2021 The Taliban’s refusal to give bin Laden up triggered the U.S. invasion, which toppled their government later that year. NBC News, 3 Sep. 2021 The war was eclipsed by the 2003 U.S. invasion of Iraq, its aims morphing and muddying with passing years. Nabih Bulos, Los Angeles Times, 30 Aug. 2021 Twelve Minutes confronts these questions head-on through the lens of the home-invasion thriller. Lewis Gordon, Wired, 18 Aug. 2021

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 invasioun "assault, attack," borrowed from Anglo-French invasion, envasioun, borrowed from Late Latin invāsiōn-, invāsiō "attack, taking possession by violence," from Latin invādere "to enter with hostile intent, assault, attack" + -tiōn-, -tiō, suffix of verbal action — more at invade

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Time Traveler for invasion

Time Traveler

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

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Last Updated

18 Oct 2021

Cite this Entry

“Invasion.” Dictionary, Merriam-Webster, Accessed 22 Oct. 2021.

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More Definitions for invasion



English Language Learners Definition of invasion

: the act of entering a place in an attempt to take control of it
: the act of entering a place in large numbers especially in a way that is harmful or unwanted


in·​va·​sion | \ in-ˈvā-zhən How to pronounce invasion (audio) \

Kids Definition of invasion

: an act of invading


in·​va·​sion | \ in-ˈvā-zhən How to pronounce invasion (audio) \

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

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in·​va·​sion | \ in-ˈvā-zhən How to pronounce invasion (audio) \

Legal Definition of invasion

: the act of or an instance of invading

More from Merriam-Webster on invasion

Nglish: Translation of invasion for Spanish Speakers

Britannica English: Translation of invasion for Arabic Speakers


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