The word `` megalomania '' is derived from the Greek μεγαλο - `` megalo - '' `` large , great '' , and μανία `` mania '' `` madness , frenzy '' .
The word `` megalomania '' comes from two Greek words : '' μεγαλο '' ( megalo - ) , meaning large or great , and '' μανία '' ( mania ) , meaning madness or frenzy .