extensive Meaning in the Cambridge English Dictionary
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Meaning of “extensive” in the English Dictionary

"extensive" in British English

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extensiveadjective

uk   us   /ɪkˈsten.sɪv/
B2 covering a ​largearea; having a ​greatrange: a ​school with extensive grounds extensive repairs to the ​motorway Her ​knowledge of ​music is extensive (= she ​knows a lot about ​music). The ​weddingreceived extensive ​coverage in the ​newspapers (= it was written about a lot).
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extensively
adverb uk   us   /-li/
The ​house was extensively ​rebuilt (= a ​largepart of it was ​rebuilt ) after the ​fire. The ​sideeffects 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 ​largearea; having or being a ​largeamount: Extensive ​roadwayrepairs are causing ​trafficproblems. Extensive also ​meanswide in ​range and ​including much ​detailedinformation: Her ​knowledge of ​music is extensive. Foster did extensive ​research on ​electromagneticfields.
extensively
adverb  us   /ɪkˈsten·sɪv·li/
The ​house was extensively ​rebuilt.
(Definition of extensive from the Cambridge Academic Content Dictionary © Cambridge University Press)
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