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INVASION

Definition:

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