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extensive

/ɪkˈstɛn.sɪv/ adjective B2
  1. Having a great extent; covering a large area; vast.
  2. Considerable in amount. (figuratively) · I have done extensive research on the subject.
  3. Serving to extend or lengthen; characterized by extension.
  4. Having a combined system entropy that equals the sum of the entropies of the independent systems.
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From the library

Matthew did not know that Samuel, in the recent expansion of his business, had set up a lady clerk also; she was a niece of his wife’s and a very dashing young person indeed, with a huge, drooping pompadour, big, rolling brown eyes, and a most extensive and bewildering smile.
Anne of Green Gables, p. 189 · C1
As for his wife, he bowed to her, as some husbands do to their wives, but in a way that bachelors will never comprehend, until a very extensive code is published on conjugal life.
The Count of Monte Cristo, p. 779 · C1
I confess this is the drollest thing I have ever met with in the course of my extensive foreign transactions, and you may readily suppose it has greatly roused my curiosity.
The Count of Monte Cristo, p. 473 · C1
To Jane, he could be only a man whose proposals she had refused, and whose merits she had undervalued; but to her own more extensive information, he was the person to whom the whole family were indebted for the first of benefits, and whom she regarded herself with an interest, if not quite so tender, at least as reasonable and just, as what Jane felt for Bingley.
Pride and Prejudice, p. 312 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.