ex ‧ ten ‧ sive W3 /ɪkˈstensɪv/ BrE AmE adjective
1 . large in size, amount, or degree:
The house stands in extensive grounds.
Fire has caused extensive damage to the island’s forests.
the extensive use of pesticides
2 . containing or dealing with a lot of information and details:
Extensive research is being done into the connection between the disease and poor living conditions.
The exhibition has received extensive coverage in the national press.
—extensively adverb :
As a student, he travelled extensively in the Middle East.