invasion
n. C / Un. the act of an army entering another country by force to take control. It can also mean a situation where a large number of people or things enter a place in an annoying way.
n. an instance of entering a country or region with an armed force, typically with the objective of conquering or occupying it. Also used to describe an unwelcome intrusion into a private or protected space.
The country prepared for a possible invasion by its neighbor.
The sudden invasion of tourists during the summer months often overwhelms the small island's infrastructure.
Historians debate whether the military invasion was a strategic necessity or a catastrophic overreach that destabilized the entire region for decades to come.
From Middle French invasion, from Late Latin invāsiōnem, accusative of invāsiō.
Countable when referring to specific military or intrusive events; uncountable when discussing the general concept of encroaching on territory.