Origin: 1350–1400;Middle English < Medieval Latinextrāvagant- (stem of extrāvagāns), present participle of extrāvagārī, equivalent to extrā-extra- + vagārī to wander
late 14c., from M.L. extravagantem, originally a word in Canon Law for uncodified papal decrees, prp. of extravagari "wander outside or beyond," from L. extra "outside of" + vagari "wander, roam." Extended sense of "excessive, extreme" first recorded 1590s; that of "wasteful, lavish" 1711. Related: Extravagantly.