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

Separately, more than 120,000 Ukrainians fleeing Russia's invasion arrived under the EU's Temporary Protection system rather than the asylum system. — Michael Dorgan, FOXNews.com, 30 Sep. 2026

Lebanon’s Hezbollah was severely weakened by an Israeli invasion into southern Lebanese villages, and the fall of Iran’s ally in Syria, Bashar al-Assad, has forced Iranian groups to concede strategic territory. — Sarah Tamimi, CNN Money, 30 Sep. 2026

In April 1943, Operation Mincemeat used a corpse carrying fake invasion plans to fool Hitler into thinking the Allies would strike Greece rather than Sicily. — Literary Hub, 30 Sep. 2026

In Europe, multiethnic capitals are pilloried by the far right as demographic time bombs, ground zero for invasions of unwanted foreigners. — Ishaan Tharoor, New Yorker, 30 Sep. 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