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
In War and Peace, Tolstoy’s concept—among a million other things—was to show how the young people who lived through the Napoleonic invasion went on to lead Russia’s first democratic uprising, the Decembrist Revolt of 1825.
—
Literary Hub, 2 June 2026
The war in Ukraine has ground on for more than four years since Russia launched its full-scale invasion in February 2022.
—Reuters, NBC news, 2 June 2026
When Europe was hit by an energy crisis after Russia’s invasion of Ukraine in 2022, the Spanish government instituted a cap on the price of natural gas to keep costs low.
—Rogé Karma, The Atlantic, 1 June 2026
More than four years since the 2022 invasion of Ukraine, Russia is facing almost daily Ukrainian attacks on its oil infrastructure while Western sanctions have made crude exports more costly.
—CNN Money, 1 June 2026
See All Example Sentences for invasion
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Literary Hub, 2 June 2026
The war in Ukraine has ground on for more than four years since Russia launched its full-scale invasion in February 2022.
—Reuters, NBC news, 2 June 2026
When Europe was hit by an energy crisis after Russia’s invasion of Ukraine in 2022, the Spanish government instituted a cap on the price of natural gas to keep costs low.
—Rogé Karma, The Atlantic, 1 June 2026
More than four years since the 2022 invasion of Ukraine, Russia is facing almost daily Ukrainian attacks on its oil infrastructure while Western sanctions have made crude exports more costly.
—CNN Money, 1 June 2026
See All Example Sentences for invasion
Cite this Entry
“Invasion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/invasion. Accessed 4 Jun. 2026.
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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