to go into or upon; to pass within the confines of; to enter; -- used of forcible or rude ingress.-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.-to attack; to infringe; to encroach on; to violate; as, the king invaded the rights of the people.-to grow or spread over; to affect injuriously and progressively; as, gangrene invades healthy tissue.-to make an invasion.