diadem

Meanings

1. An ornamental headband worn as a badge of royalty.
2. A crown.
3. Regal power; sovereignty; empire—considered as symbolized by the crown.
4. An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its centre.

1. To adorn with a diadem; to crown.

Etymology

From Middle English diademe, dyademe, from Old French diademe, from Latin diadēma, from Ancient Greek διάδημα (diádēma, “band, especially worn around a tiara”), from διαδέω (diadéō, “bind around”).