megalomaniac

Megalomania is a psychopathological condition characterized by fantasies of power, relevance, omnipotence, and by inflated self-esteem. Historically it was used as a name for narcissistic personality disorder prior to the latter's first use by Heinz Kohut in 1968, and is used today as a non-clinical equivalent. It is not mentioned in the Diagnostic and Statistical Manual of Mental Disorders (DSM) or the International Statistical Classification of Diseases (ICD).