Definitions of extensive:

• adjective:   large in spatial extent or range

  Example: "An extensive Roman settlement in northwest England"

• adjective:   of agriculture; increasing productivity by using large areas with minimal outlay and labor

  Example: "Producing wheat under extensive conditions"

• adjective:   having broad range or effect

  Example: "Had extensive press coverage"

• adjective:   large in number or quantity (especially of discourse)

  Example: "Extensive press coverage"

• adjective:   great in range or scope

  Example: "Extensive examples of picture writing"