invasion
noun
in·va·sion
in-ˈvā-zhən 
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
Battles will also almost certainly resemble the combat sparked by Russia’s invasion of Ukraine.
—
Tom Vanden Brook, USA Today, 2 Aug. 2025
The king tells him that Maui is vulnerable to an invasion from the kingdom of Oahu.
—Nina Metz, Chicago Tribune, 1 Aug. 2025
New satellite imagery has surfaced showing China's enigmatic new landing barges—vessels believed to have been designed to support large-scale amphibious assaults, such as a potential invasion of Taiwan.
—Micah McCartney, MSNBC Newsweek, 1 Aug. 2025
Germany has sent three Patriot systems to Ukraine since Russia’s invasion kicked off in late February 2022.
—Filip Timotija, The Hill, 1 Aug. 2025
See All Example Sentences for invasion
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Tom Vanden Brook, USA Today, 2 Aug. 2025
The king tells him that Maui is vulnerable to an invasion from the kingdom of Oahu.
—Nina Metz, Chicago Tribune, 1 Aug. 2025
New satellite imagery has surfaced showing China's enigmatic new landing barges—vessels believed to have been designed to support large-scale amphibious assaults, such as a potential invasion of Taiwan.
—Micah McCartney, MSNBC Newsweek, 1 Aug. 2025
Germany has sent three Patriot systems to Ukraine since Russia’s invasion kicked off in late February 2022.
—Filip Timotija, The Hill, 1 Aug. 2025
See All Example Sentences for invasion
Cite this Entry
“Invasion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/invasion. Accessed 6 Aug. 2025.
Copy CitationKids Definition
invasion
noun
in·va·sion
in-ˈvā-zhən
: an act of invading
especially
: entrance of an army into a country for conquest
Medical Definition
invasion
noun
in·va·sion
in-ˈvā-zhən
: 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
: the act of or an instance of invading
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