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
Most observers believe that an invasion is not imminent; the risk of an all-out war with the U.S., potentially killing hundreds of thousands of people, is too great.
—
Dexter Filkins, The New Yorker, 3 Feb. 2025
These words – invasion, emergency, terrorist organizations – have legal meanings that give the president particular powers to mobilize the U.S. military.
—Anna Mulrine Grobe, The Christian Science Monitor, 30 Jan. 2025
The tense home invasion horror thriller stars Alicia Sanz as a pregnant realtor preparing for an open house at a property with a dark past.
—Melanie Goodfellow, Deadline, 30 Jan. 2025
Authorities in Arapahoe County, Colo. had been on the hunt for Anderson Zambrano-Pacheco since September 2024, after doorbell surveillance footage linked him to a home invasion in Aurora, Colo.
—Elizabeth Keogh, New York Daily News, 30 Jan. 2025
See all Example Sentences for invasion 
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Dexter Filkins, The New Yorker, 3 Feb. 2025
These words – invasion, emergency, terrorist organizations – have legal meanings that give the president particular powers to mobilize the U.S. military.
—Anna Mulrine Grobe, The Christian Science Monitor, 30 Jan. 2025
The tense home invasion horror thriller stars Alicia Sanz as a pregnant realtor preparing for an open house at a property with a dark past.
—Melanie Goodfellow, Deadline, 30 Jan. 2025
Authorities in Arapahoe County, Colo. had been on the hunt for Anderson Zambrano-Pacheco since September 2024, after doorbell surveillance footage linked him to a home invasion in Aurora, Colo.
—Elizabeth Keogh, New York Daily News, 30 Jan. 2025
See all Example Sentences for invasion
Articles Related to invasion
Dictionary Entries Near invasion
Cite this Entry
“Invasion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/invasion. Accessed 8 Feb. 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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