MarshallesePronunciation: /ˌmɑːʃəˈliːz/Definition of Marshallese noun (plural same) 1a native or inhabitant of the Marshall Islands. 2 [mass noun] the Micronesian language of the Marshallese. adjective relating to the Marshall Islands, their inhabitants, or their language. Marshallese in other Oxford dictionaries Definition of Marshallese in the US English dictionary