indonesia is the fourth most populous nation in the world. of tis large population the number of people who fluently speak indonesian is fast approaching 100%, thus making indonesian one of the most widely spoken languages in the world. most indonesian, aside from speaking the national language, are often fluent in another regional language examples include chins language which are commonly used at home and with in the local community. most formal education, as well as nearly all national media and other forms of communication, are conducted in indonesian. in east timor, which was an indonesian province from 1975 to 1999, indonesian is recognized by the constitution as one of the two working language ( the other is english, alongside the official language of tetum and portuguese.