a crown.
a cloth headband, sometimes adorned with jewels, formerly worn by Oriental kings.
royal dignity or authority.
verb (used with object)
to adorn with or as if with a diadem; crown.

1250–1300; Middle English diademe (< Anglo-French) < Latin diadēma < Greek diádēma fillet, band, equivalent to diadē- (verbid stem of diadeîn to bind round + -ma noun suffix

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World English Dictionary
diadem (ˈdaɪəˌdɛm)
1.  a royal crown, esp a light jewelled circlet
2.  royal dignity or power
3.  (tr) to adorn or crown with or as with a diadem
[C13: from Latin diadēma, from Greek: fillet, royal headdress, from diadein to bind around, from dia- + dein to bind]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 13c., from L. diadema "cloth band worn around the head as a sign of royalty," from Gk. diadema, from diadein "to bind across," from dia- "across" + dein "to bind," related to desmos "band." Used of the headband worn by Persian kings and adopted by Alexander the Great and his successors.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Diadem definition

the tiara of a king (Ezek. 21:26; Isa. 28:5; 62:3); the turban (Job 29:14). In the New Testament a careful distinction is drawn between the diadem as a badge of royalty (Rev. 12:3; 13:1; 19:12) and the crown as a mark of distinction in private life. It is not known what the ancient Jewish "diadem" was. It was the mark of Oriental sovereigns. (See CROWN.)

Easton's 1897 Bible Dictionary
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Example sentences
She wears a diadem in her wavy hair, which is gathered in the back.
Now jewelers are taking the stuffiness out of the diadem.
It will adorn your head with a far brighter diadem than that which you wear, as it will be the fruit only of your own virtue.
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