immigrant /ˈɪmɪɡɹənt/noun 2adjective 1forms 1 noun2 •A non-native person who comes to a country from another country to permanently settle there.Approximately 1.5 million Mexicans are descendants of Irish immigrants. •A plant or animal that establishes itself in an area where it previously did not exist. adjective1 •Of or relating to immigrants or the act of immigrating. formsimmigrants