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Noun: invasion  in'vey-zhun
  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 locusts";
    - encroachment, intrusion
  3. (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body
    "the tumour's invasion of surrounding structures"

Derived forms: invasions

Type of: entering, entrance, incursion, penetration, spread, spreading

Encyclopedia: Invasion, Planeshift, Apocalypse