Micronesian Syllabification: (Mi·cro·ne·sian)Pronunciation: /ˌmīkrəˈnēZHən/Definition of Micronesian adjective of or relating to Micronesia, its people, or their languages. noun 1a native of Micronesia. 2the group of Austronesian languages spoken in Micronesia. Micronesian in other Oxford dictionaries Definition of Micronesian in the British & World English dictionary