Definition of "Nusantara"

Indonesian Archipelago, the islands comprising the country of Indonesia or to the geographical groups which include its islands.  examples

Endonym for the Republic of Indonesia, including everything contained within it (i.e., covering the regions, people, cultures, languages, etc.).  examples

The planned capital city of Indonesia, in East Kalimantan  examples

(historical, archaic) The conquered territories of the Majapahit empire, corresponding to present-day Indonesia (main) and several Southeast Asian countries.