mandamus Syllabification: (man·da·mus)Pronunciation: /manˈdāməs/Definition of mandamus noun Law a judicial writ issued as a command to an inferior court or ordering a person to perform a public or statutory duty:a writ of mandamusOrigin: mid 16th century: from Latin, literally 'we command'mandamus in other Oxford dictionaries Definition of mandamus in the British & World English dictionary