|Origin:||invadere, from vadere 'to go'|
1 [intransitive and transitive]PM
to enter a country, town, or area using military force, in order to take control of it:
The Romans invaded Britain 2000 years ago.
to go into a place in large numbers, especially when you are not wanted:
Every summer the town is invaded by tourists.
Fans invaded the pitch at half-time.
to get involved in something in an unwanted and annoying way:
What right does he have to invade my privacy?
Patients are given the feeling that they mustn't try to invade medical territory (=try to deal with things that are not their responsibility).