- The definition of an invasion is the entering or taking over of a place, or being entered by force.
- An example of an invasion is a military attack on a town.
- An example of an invasion is the infestation of a bug on a crop.
- An example of an invasion is the spread of a virus.
invasion definition by Webster's New World
- an entering or being entered by an attacking military force
- an intrusion or infringement
- the onset, appearance, or spread of something
Origin: Middle French ; from Late Latin invasio ; from Classical Latin invasus, past participle of invadere
invasion definition by American Heritage Dictionary
- The act of invading, especially the entrance of an armed force into a territory to conquer.
- A large-scale onset of something injurious or harmful, such as a disease.
- An intrusion or encroachment.
Origin: Middle English invasioun, from Old French invasion, from Late Latin invāsiō, invāsiōn-, from invāsus, past participle of invādere, to invade; see invade.