Jagiellonian UK /ˌjɑːɡjəˈləʊ.ni.ən/US /ˌjɑɡjəˈloʊ.ni.ən/ adjective1 •(historical) Of or relating to the royal dynasty founded by Jogaila, the Grand Duke of Lithuania, which reigned in several Central European countries between the 14th and 16th centuries. formsmore Jagiellonian · most Jagiellonian
