IndonesianPronunciation: /ɪndəˈniːzɪən, -ʒ(ə)n/Translate Indonesian | into Italian | into Spanish Definition of Indonesian adjective relating to Indonesia, Indonesians, or their languages. noun 1a native or inhabitant of Indonesia. 2 [mass noun] the group of Austronesian languages, closely related to Malay, which are spoken in Indonesia and neighbouring islands. another term for Bahasa Indonesia.Indonesian in other Oxford dictionaries Definition of Indonesian in the US English dictionary