—n.
1 a crown or headband worn as a sign of sovereignty.
2 a wreath of leaves or flowers worn round the head.
3 sovereignty.
4 a crowning distinction or glory.
—v.tr. (esp. as diademed adj.) adorn with or as with a diadem.
Etymology: ME f. OF diademe f. L diadema f. Gk diadema (as DIA-, deo bind)
Useful english dictionary. 2012.