Definition of

Invade

  1. (verb, competition) march aggressively into another's territory by military force for the purposes of conquest and occupation
  2. (verb, contact) penetrate or assault, in a harmful or injurious way
  3. (verb, motion) to intrude upon, infringe, encroach on, violate
    The neighbors intrude on your privacy
  4. (verb, stative) occupy in large numbers or live on a host

via WordNet, Princeton University

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