invasion

noun

in·​va·​sion in-ˈvā-zhən How to pronounce invasion (audio)
1
: an act of invading
especially : incursion of an army for conquest or plunder
2
: the incoming or spread of something usually hurtful

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
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
At least 2,400 American troops died during the invasion on Omaha Beach. Chandelis Duster, NPR, 20 July 2025 When the Russian Federation launched its full-scale invasion of Ukraine in February 2022, the Russians turned to the CSTO for assistance. Mark Temnycky, Forbes.com, 18 July 2025 The New York Times reports that climate change may catapult the mushrooms’ invasion even farther in North America, by making more areas of the continent increasingly habitable for the species. Amber X. Chen, Smithsonian Magazine, 18 July 2025 The arrest comes at a pivotal moment for the U.S. and Russia, as President Donald Trump hardens his stance against Moscow after months of diplomatic engagement to end the Russian invasion of Ukraine. Shane Croucher, MSNBC Newsweek, 18 July 2025 See All Example Sentences for invasion

Word History

Etymology

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

First Known Use

15th century, in the meaning defined at sense 1

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

Browse Nearby Words

Cite this Entry

“Invasion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/invasion. Accessed 26 Jul. 2025.

Kids Definition

invasion

noun
in·​va·​sion in-ˈvā-zhən How to pronounce invasion (audio)
: an act of invading
especially : entrance of an army into a country for conquest

Medical Definition

invasion

noun
in·​va·​sion in-ˈvā-zhən How to pronounce invasion (audio)
: 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

Legal Definition

invasion

noun
in·​va·​sion in-ˈvā-zhən How to pronounce invasion (audio)
: the act of or an instance of invading

More from Merriam-Webster on invasion

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