Extensive definition

The magazine appeals to people with an extensive knowledge of cars, car-parts and the car-industry.

Covering, substantial, huge, broad, covering a large area, having a great range, having or being a large amount, widespread, having a large scope or extent.

The definition of extensive is something that covers a large area or has wide influence or effect.

“The hospital was much more extensive than I expected.” I didn’t know he had such an extensive library”.