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in·vade  (n-vd)
v. in·vad·ed, in·vad·ing, in·vades
1. To enter by force in order to conquer or pillage.
2. To encroach or intrude on; violate: The principal of the trusts could not be invaded without trustee approval (Barbara Goldsmith).
3. To overrun as if by invading; infest: About 1917 the shipworm invaded the harbor of San Francisco (Rachel Carson).
4. To enter and permeate, especially harmfully.
To make an invasion: The X-rays showed that the cancer, which had invaded deeply into the chest cavity, was retreating (Zach Rosen).

[Middle English, from Old French invader, from Latin invdere : in-, in; see in-2 + vdere, to go.]

in·vader n.

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