Etymology
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tiara (n.)

1550s, "headdress of the Persian kings" (also worn by men of rank), from Latin tiara, from Greek tiara, of unknown origin. Earlier in Englished form tiar (1510s). As a richly jeweled headband in Western wear, 1650s (tiar; 1718 as tiara). Related: Tiaraed.

updated on February 09, 2014

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Definitions of tiara from WordNet

tiara (n.)
a jeweled headdress worn by women on formal occasions;
From wordnet.princeton.edu, not affiliated with etymonline.