verb (v)

• march aggressively into another's territory by military force for the purposes of conquest and occupation(verb.competition)

  Example:
  Hitler invaded Poland on September 1, 1939.
  

  Synonym:
  occupy
  

  source: wordnet30
• to intrude upon, infringe, encroach on, violate(verb.motion)

  Example:
  This new colleague invades my territory.
  

  Synonym:
  encroach upon, intrude on, obtrude upon
  

  source: wordnet30
• occupy in large numbers or live on a host(verb.stative)

  Synonym:
  infest, overrun
  

  source: wordnet30
• penetrate or assault, in a harmful or injurious way(verb.contact)

  Example:
  The cancer had invaded her lungs.
  

  source: wordnet30
• To go into or upon; to pass within the confines of; to enter; -- used of forcible or rude ingress.(verb)

  source: webster1913
• To make an invasion.(verb)

  source: webster1913