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

• descent
• foray
• incursion
• inroad
• irruption
• 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

China demonstrated its pull on the world stage by welcoming a delegation from Saudi Arabia with its first pavilion at the event, as well as its close ties with Russia even as that country is isolated from Western nations and their allies due to its invasion of Ukraine. —Reuters, NBC News, 14 Nov. 2024

Geopolitical events, including the Russian invasion of Ukraine and the Israel-Hamas war, have been noted as factors that could impact the company's ability to complete a business combination due to potential adverse effects on financial and business conditions in Europe. —Quartz Bot, Quartz, 14 Nov. 2024

The aftermath of Israel’s 1982 invasion illustrates another stark fact: permanently weakening or even defeating an organization can give rise to new ones. —Sarah E. Parkinson, Foreign Affairs, 11 Nov. 2024

Since Russia's invasion of Ukraine in 2022, international alarm has arisen over the hostilities taking place around southern Ukraine's Zaporizhzhia nuclear power plant (NPP), which Russia captured at the start of the war. —Thomas G. Moukawsher, Newsweek, 5 Nov. 2024

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

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