What does invasion mean?
An invasion is a forceful entry into a place, especially an armed attack involving an army or other organized force. The word is used in international affairs, history, and discussions of territorial conflict, where it carries strong associations of aggression, coercion, and the violation of another group's control or sovereignty. It can also describe an unwelcome intrusion into a person's privacy, rights, or activities, as in an invasion of privacy, or a sudden and damaging spread of something into a new area. In these figurative uses, the word emphasizes disruption, unwelcome presence, or breach of a boundary. Because of its serious and often politically charged associations, invasion is more forceful than intrusion and usually suggests a clearer violation of territorial or personal boundaries.
nounAn act of entering a territory by force, especially an armed attack or occupation. It can also refer to an unwelcome intrusion into someone's privacy, rights, or established boundaries.
- An armed attack or the forceful entry and occupation of another territory.
- An unwelcome intrusion into privacy, rights, activities, or a protected space.
- A sudden widespread appearance or arrival of something, such as an invasive species or harmful influence.
"The government condemned the invasion as a violation of national sovereignty."
"The island nation was left vulnerable to invasion by its larger neighbour."
"The advertisement was widely criticized as an invasion of privacy."
The plural is used for separate acts of invading or instances of intrusion.
"The fortified border was designed to deter further invasions."
An invasion is not merely an arrival: it carries the implication of force, resistance, and a struggle over control.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does invasion come from?
Invasion comes through Old French invasion from Latin invasio, a noun derived from invadere, meaning “to enter by force.” The Latin verb combines in- (“in” or “into”) with vadere (“to go”), reflecting an entering or going upon. English adopted the word in the Middle English period for a hostile armed entry, and its later figurative senses developed from that original military meaning.
Related word forms
How invasion is actually used
The term is strongly associated with armed conflict and is normally used when one state or organized force enters another territory by force. In figurative contexts, it suggests an unwelcome or disruptive intrusion.
Easily confused with invasion
An invasion generally implies a forceful and potentially sustained entry, especially by an army, whereas an incursion can be a temporary or less organized incursion into a place.
An invasion often concerns a large-scale armed attack, while an intrusion emphasizes an unauthorized entry into a space, system, or privacy.