illuminated UK /ɪˈl(j)uːmɪneɪtɪd/US /ɪˈlumɪneɪtɪd/ adjective2 •Irradiated by light, lit.A flash of emerald light briefly illuminated the forest, and the stone vanished. — 2003 •Decorated and illustrated.On the table lay an illuminated missal and a silver crucifix. The Abbess herself was seated in the chair—pale, abstracted, and with features whose expression, in repose at least, was severe. — 1831 formsmore illuminated · most illuminated