free city

/F R IY1 S IH0 T IY0/
noun
  1. 1

    Any of various types of city of Europe from classical to modern times, characterised by relative autonomy and/or being responsible only and directly to a king or emperor; a more modern city of such type, sometimes elsewhere than in Europe.

  2. 2

    A special economic zone.

Source: https://en.wiktionary.org/wiki/free%20city