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Definition of diadem:

  1. An arch rising from the rim of a crown ( rarely also of a coronet), and uniting with others over its center.
  2. Originally, an ornamental head band or fillet, worn by Eastern monarchs as a badge of royalty; hence ( later), also, a crown, in general.
  3. Regal power; sovereignty; empire; - considered as symbolized by the crown.
  4. To adorn with a diadem; to crown.


poll, summit, cap, crownwork, peak, crest, pennant, pate, jacket, top, jacket crown, treetop, crown, tip.

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