tiara /tiˈɑɹə/noun 2verb 2forms 5 noun2 •The three-tiered papal crown. •An ornamental coronet.[T]heir tiarae are like those of the magi; […] — 1842 verb2 •(rare) To adorn as a tiara.Brilliants tiaraed her head. •(rare) To adorn with a tiara.He tiaraed her head. formstiaraed · tiaraing · tiaras · tiarae · tiarae