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 of invasion

• 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

Hezbollah arose after Israel’s 1982 invasion of Lebanon, which was aimed at dismantling the Palestine Liberation Organization’s presence in the country. — Ron Kampeas, The Washington Examiner, 25 July 2026

When Russia invaded Ukraine in February 2022, for example, several contractors initially outperformed—but, according to a Fisher Investment analysis, much of those gains had already occurred before the invasion. — Preston Fore, Fortune, 25 July 2026

Elon Musk, the richest man in the world, joined the online tantrum over the casting of the actor Lupita Nyong’o as Helen, whose presence in Troy justified Agamemnon’s invasion. — Adam Serwer, The Atlantic, 24 July 2026

The withdrawal of funding was made in response to Russia’s participation in this year’s Biennale for the first time since the full-scale invasion of Ukraine in 2022. — Tessa Solomon, ARTnews.com, 24 July 2026

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