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Definition of “extensive” - English Dictionary

"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)







"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).

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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 Learners Dictionary & Thesaurus © Cambridge University Press)
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