Definition of "diadem" in Englisch

noun

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. (heraldry) An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its centre.

verb

1. To adorn with a diadem; to crown.