extensively
BrE /ɪkˈstensɪvli/ AmE /ɪkˈstensɪvli/
adverb en → es
to a great degree or extent; thoroughly
extensivamente, en gran medida
Collocations research extensively · use something extensively
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They researched the topic extensively.
Investigaron el tema extensivamente.
over a large area or in many places; widely
extensamente, ampliamente
Collocations spread extensively · grow extensively
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The disease spread extensively across the country.
La enfermedad se extendió extensamente por todo el país.