American Samoa UK /əˈmɛɹ.ɪ.kən səˈməʊ.ə/US /əˈmɛɹ.ɪ.kən səˈmoʊ.ə/ noun1 •An archipelago and overseas territory of the United States in the Pacific Ocean. Official name: Territory of American Samoa. It is distinct from Samoa (formerly: Western Samoa).