Definition of tiara noun from the Oxford Advanced Learner's Dictionary

 

tiara

 noun
noun
BrE BrE//tiˈɑːrə//
 
; NAmE NAmE//tiˈɑːrə//
 
Jewellery
 
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a piece of jewellery like a small crown decorated with precious stones, worn by a woman, for example a princess, on formal occasions See related entries: Jewellery Word Origin mid 16th cent. (denoting the Persian royal headdress): via Latin from Greek, partly via Italian. The current sense dates from the early 18th cent.
See the Oxford Advanced American Dictionary entry: tiara