- the act of invading with armed forces
- any encroachment or intrusion: an invasion of rats
- the onset or advent of something harmful, esp of a disease
- 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
WordReference Random House Learner's Dictionary of American English © 2026
in•va•sion /ɪnˈveɪʒən/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- an act or instance of invading, esp. by an army.
- the entrance or coming of anything troublesome or harmful, as disease.
- entrance so as to overrun:the annual invasion of tourists.
- infringement;
intrusion:an invasion of one's privacy.
in•va•sion
(in vā′zhən),USA pronunciation n.
- an act or instance of invading or entering as an enemy, esp. 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.
- Late Latin invāsīon- (stem of invāsiō), equivalent. to invās(us), past participle of invādere + -iōn- -ion; see invade
- late Middle English 1400–50
Collins Concise English Dictionary © HarperCollins Publishers::
invasion /ɪnˈveɪʒən/ n
'invasion' also found in these entries (note: many are not synonyms or translations):
Abdelkader
- Bay of Pigs
- beacon
- Cassivelaunus
- Chamberlain
- Darlan
- Dover
- Dubček
- Ethelred I
- Fallujah
- Finland
- function creep
- Green Zone
- Gulf War
- Hawke
- home invasion
- Hussein
- incursion
- infection
- inroad
- invasive
- Iran-Iraq War
- Iraq
- kamikaze
- Lingayen Gulf
- Louis VIII
- Maginot line
- Montgomery
- Norman Conquest
- Numidia
- pod person
- Ruyter
- Sedan
- Sestos
- Thermopylae
- World War II
- Yugoslavia
- aggression
- Aius Locutius
- armed neutrality
- Army of the Potomac
- assault
- Barbarossa
- blood poisoning
- bran
- D-day
- exposure
- foray
- gold
- Grenada