Dacian UK /ˈdeɪsɪən/US /ˈdeɪʃən/adjective 3noun 3forms 1 adjective3 •Of or pertaining to Dacia or the Dacians. •(literary, rare) Of or pertaining to Romania or Romanians. •(no longer used) Of or pertaining to Denmark or the Danes. noun3 •(historical) a member of an ancient Indo-European ethnic group of Dacia. •(literary, rare) a Romanian. •(no longer used) a Dane, Denmark having been known as Dacia in Medieval Latin. formsDacians