Lydian UK /ˈlɪ.dɪ.ən/US /ˈlɪ.di.ən/adjective 2noun 1forms 1 adjective2 •Pertaining to Lydia, or its people, language or culture. •Designating a mode of ancient Greek music, reputed to be light and effeminate.And all the while sweet Musicke did diuide Her looser notes with Lydian harmony […] — 1590 noun1 •A native or inhabitant of ancient Lydia. formsLydians