1. a crown.
  2. a cloth headband, sometimes adorned with jewels, formerly worn by monarchs in Asia Minor and other parts of the East.
  3. royal dignity or authority.

verb (used with object)

  1. to adorn with or as if with a diadem; crown.


  1. a royal crown, esp a light jewelled circlet
  2. royal dignity or power


  1. (tr) to adorn or crown with or as with a diadem

late 13c., from Old French diademe and directly from Latin diadema “cloth band worn around the head as a sign of royalty,” from Greek diadema, from diadein “to bind across,” from dia- “across” (see dia-) + dein “to bind,” related to desmos “band,” from PIE *de- “to bind.” Used of the headband worn by Persian kings and adopted by Alexander the Great and his successors.

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