- an act or instance of invading or entering as an enemy, especially by an army.
- the entrance or advent of anything troublesome or harmful, as disease.
- entrance as if to take possession or overrun: the annual invasion of the resort by tourists.
- infringement by intrusion.
Origin of invasion
Examples from the Web for invasion
Figuring how to train Iraqi forces has dogged the United States since the 2003 invasion.Pentagon Insider on New Plan to Fight ISIS: ‘Of Course It’s Not Enough’
Nancy A. Youssef
January 6, 2015
One lefty tweeter even complained that an invasion of icky American tourists would undermine “family values” in Cuba.Castro's Hipster Apologists Want to Keep Cuba ‘Authentically’ Poor
December 18, 2014
Hikmatullah Shadman started working for American Special Forces teams in 2002 after the invasion that toppled the Taliban.Special Forces’ $77M ‘Hustler’ Hits Back
December 8, 2014
And Western capitals sought to play down the Russian invasion.Should the U.S. Arm Ukraine’s Militias?
November 24, 2014
That left nuclear weapons as the only resort to stop a Soviet invasion.I Saw Nuclear Armageddon Sitting on My Desk
November 10, 2014
On the invasion of William, as we have seen, it was in the possession of Edwin, sovereign of Deira.The Grand Old Man
Richard B. Cook
Napoleon was silent a moment, as if protesting against this invasion of his privacy.The Boy Life of Napoleon
This was at a moment when all England was in arms, in anticipation of an invasion from France.Ned Myers
James Fenimore Cooper
All those who could bear a musket were gone to meet the invasion.In the Valley
I rubbed my sleepy eyes, and could not quite understand the meaning of this invasion.My Double Life
- the act of invading with armed forces
- any encroachment or intrusionan invasion of rats
- the onset or advent of something harmful, esp of a disease
- pathol the spread of cancer from its point of origin into surrounding tissues
- the movement of plants to a new area or to an area to which they are not native
Word Origin and History for invasion
mid-15c., from Old French invasion "invasion, attack, assaut" (12c.), from Late Latin invasionem (nominative invasio) "an attack, invasion," noun of action from past participle stem of Latin invadere "go into, fall upon, attack, invade," from in- "in" (see in- (2)) + vadere "go, walk" (see vamoose).