To move into.
Under some circumstances police are allowed to invade a person's privacy.
To enter by force in order to conquer.
Argentinian troops invaded the Falkland Islands in 1982.
To infest or overrun.
The picnic was invaded by ants.
To attack; to infringe; to encroach on; to violate.
The king invaded the rights of the people.
To make an unwelcome or uninvited visit or appearance, usually with an intent to cause trouble or some other unpleasant situation.