Meaning of “extensive” in the English Dictionary

"extensive" in British English

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extensiveadjective

uk /ɪkˈsten.sɪv/ us /ɪkˈsten.sɪv/

B2 covering a large area; having a great range:

a school with extensive grounds
extensive repairs to the motorway
Her knowledge of music is extensive (= she knows a lot about music).
The wedding received extensive coverage in the newspapers (= it was written about a lot).

More examples

extensively
adverb uk /ɪkˈsten.sɪv.li/ us /ɪkˈsten.sɪv.li/

The house was extensively rebuilt (= a large part of it was rebuilt ) after the fire.
The side effects of the new drug are being extensively researched (= are being studied in detail).

(Definition of “extensive” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"extensive" in American English

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extensiveadjective

us /ɪkˈsten·sɪv/

covering a large area; having or being a large amount:

Extensive roadway repairs are causing traffic problems.

Extensive also means wide in range and including much detailed information:

Her knowledge of music is extensive.
Foster did extensive research on electromagnetic fields.
extensively
adverb us /ɪkˈsten·sɪv·li/

The house was extensively rebuilt.

(Definition of “extensive” from the Cambridge Academic Content Dictionary © Cambridge University Press)