Lewis Short
magnātus | magnas, ātis (noun M.m) : m., and , , m.id.
* A great man, important person, magnate (post-class.): omnes magnates,Vulg. Judith, 5, 26: in conspectu magnatorum,id. Sir. 38, 3; 33, 19; Inscr. ap. Demster. ad Rosini Antiq. 2, 12: magnates, μεγιστᾶνες, Gloss.
Charlton T. Lewis, Charles Short, A Latin Dictionary