vt to adorn with a diadem; to crown.
2. diadem ·noun regal power; sovereignty; empire;
considered as symbolized by the crown.
3. diadem ·noun an arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its center.
4. diadem ·noun originally, an ornamental head band or fillet, worn by eastern monarchs as a badge of royalty; hence (later), also, a crown, in general.