Invasion - Definition
invasion
n 1: the act of invading; the act of an army that invades for
conquest or plunder
2: any entry into an area not previously occupied; "an invasion
of tourists"; "an invasion of locusts" [syn: invasion,
encroachment, intrusion]
3: (pathology) the spread of pathogenic microorganisms or
malignant cells to new sites in the body; "the tumor's
invasion of surrounding structures"