·vt To adorn with a diadem; to Crown.
II. Diadem ·noun Regal power; sovereignty; empire;
— considered as symbolized by the crown.
III. Diadem ·noun An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its center.
IV. 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.