In·vade v. t. [imp. & p. p. Invaded; p. pr. & vb. n. Invading.]
  1. To go into or upon; to pass within the confines of; to enter; -- used of forcible or rude ingress. [Obs.]
  Which becomes a body, and doth then invade
  The state of life, out of the grisly shade.   --Spenser.
  2. To enter with hostile intentions; to enter with a view to conquest or plunder; to make an irruption into; to attack; as, the Romans invaded Great Britain.
  Such an enemy
  Is risen to invade us.   --Milton.
  3. To attack; to infringe; to encroach on; to violate; as, the king invaded the rights of the people.
  4. To grow or spread over; to affect injuriously and progressively; as, gangrene invades healthy tissue.
  Syn: -- To attack; assail; encroach upon. See Attack.
  invading
       adj : involving invasion or aggressive attack; "invasive war"
             [syn: incursive, invasive]