plural invasions
1
: the act of invading something: such as
a
: the act of entering a place in an attempt to take control of it
The enemy launched/mounted an invasion.
the invasion of Poland
The people live under a constant threat of invasion.
b
: the act of entering a place in large numbers especially in a way that is harmful or unwanted
The town is gearing up for the annual tourist invasion.
an invasion of/by insects
protecting the house from insect invasion
2
Note: An invasion of privacy is a situation in which someone tries to get information about a person's private life in an unwanted and usually improper way.
Cite this Entry
“Invasion.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/invasion. Accessed 18 Apr. 2026.
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