Austronesian language aust·ro·ne·sianlanguage uncommon noun 1. the family of languages spoken in Australia and Formosa and Malaysia and Polynesia SynonymsAustronesianAustronesian language Related words Broader terms natural language Narrower terms Malayo-PolynesianAustralianFormosan WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.