/ ɪnˈveɪd; NAmE / verb
1.
to enter a country, town, etc. using military force in order to take control of it :
[ v ]
Troops invaded on August 9th that year.
[ vn ]
When did the Romans invade Britain?
2.
[ vn ] to enter a place in large numbers, especially in a way that causes damage or confusion :
Demonstrators invaded the government buildings.
As the final whistle blew, fans began invading the field.
The cancer cells may invade other parts of the body.
3.
[ vn ] to affect sth in an unpleasant or annoying way :
Do the press have the right to invade her privacy in this way?
—see also invasion , invasive
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WORD ORIGIN
late Middle English (in the sense attack or assault (a person) ): from Latin invadere , from in- into + vadere go.