Hainan /haɪˈnɑːn/ noun2 •A province off the coast of southern China, primarily made up of Hainan Island. Capital: Haikou. •A Tibetan autonomous prefecture of Qinghai, China. Official name: Hainan Tibetan Autonomous Prefecture.Members of the party committee of the Hainan Tibetan Autonomous District have attached great importance to implementing the correct line. — 1971