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Noun invasion has 3 senses
  1. invasion - the act of invading; the act of an army that invades for conquest or plunder
    --1 is a kind of
    penetration, incursion
    --1 has particulars: inroad
    Derived form: verb invade1
  2. invasion, encroachment, intrusion - any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts"
    --2 is a kind of entrance, entering
    Derived forms: verb invade2, verb invade3
  3. invasion - (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body; "the tumor's invasion of surrounding structures"
    --3 is a kind of
    spread, spreading
    Derived form: verb invade4
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