1. A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence.
2. An obsession with grandiose or extravagant things or actions.

A person needs complete control over everything such as a world or a timeline

an insane person who is obsessed with power, one who thinks they are beyond greatness

My Definition is a belief is so strong that I am so powerful even more powerful than god
I am paronaid of all things and make sure all my phones are not tapped
I say bring it on to take over the world
Any one standing in my way is un patrotic

one who has dillusions of granduer, such as one who thinks they are jesus or that they are the air to the seceret leader of the illuminati.

A bad-ass song by the founders of industrial rock, KMFDM.

Megalomaniac = George Dubya