greenfield

/G R IY1 N F IY0 L D/
noun
  1. 1

    A site, to be used for housing or commerce, whose previous use (if any) was agricultural

adjective
  1. 1

    Being a completely new development, without the need to integrate with legacy systems etc.

    โ€œa greenfield projectโ€

  2. 2

    Previously untapped; free for the taking.

    โ€œa greenfield marketโ€

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