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

Synonyms

• incursion
• raid

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

Since Russia’s full-scale invasion in February 2022, Ukrainian President Volodymyr Zelenskyy has appealed for foreign fighters to join his country’s International Legion, which supplements the army’s ranks to counter Russia’s incursion. —Rebecca Johns, Miami Herald, 6 Sep. 2025

Set in a Korean high school under assault from a zombie invasion, the students must escape while many of them are killed or turn. —Paul Tassi, Forbes.com, 6 Sep. 2025

Venice has often been seen as the most glamorous and least political of the major film festivals, but in 2025, the movies that made the strongest impact focused on current events, with the ongoing Israeli invasion of Gaza casting a long shadow. —Crispian Balmer, USA Today, 6 Sep. 2025

Mark Ruffalo stars as a FBI detective tasked with investigating a string of aggressive home-invasion robberies in Philadelphia. —Savannah Salazar, Vulture, 5 Sep. 2025

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

Phrases Containing invasion

• counter-invasion
• invasion of (someone's) privacy
• pre-invasion

Rhymes for invasion

• abrasion
• caucasian
• equation
• eurasian
• evasion
• occasion
• persuasion
• asian
• suasion
• athanasian

Kids 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