extensive

/ษ›ksหˆtษ›n.sษชv/
adjective
  1. 1

    Having a great extent; covering a large area; vast

  2. 2

    Considerable in amount.

    โ€œI have done extensive research on the subject.โ€

  3. 3

    Serving to extend or lengthen; characterized by extension

  4. 4

    Having a combined system entropy that equals the sum of the entropies of the independent systems.

Source: https://en.wiktionary.org/wiki/extensive