Invasion

'Invasion'

[invasion.n.01] as in: the act of invading; the act of an army that invades for conquest or plunder

'Invasion'

[invasion.n.02] as in: any entry into an area not previously occupied

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Examples:
an invasion of tourists
an invasion of locusts

'Invasion'

[invasion.n.03] as in: (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body

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Examples:
the tumor's invasion of surrounding structures