invasion Definition

invasion
noun

1. An act of invading or process of being invaded, eg by a hostile country or by something harmful.

Thesaurus: intrusion, violation, assault, attack, infraction, usurpation, infiltration, encroachment, foray, raid, seizure.
2. An encroachment or violation.
3. pathol.
The spread of a disease from its place of origin to other places in the living organism affected by it.
4. ecol.
The spread of a species of plant to an area where it previously did not grow.

Derivative: invasive
adj

Etymology: 16c: from Latin invasio, from invadere to invade.