Longman Dictionary of Contemporary English homepage

extensive

adjective
     
ex‧ten‧sive W3
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.

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