meg·a·lo·ma·ni·a 
(mĕg′ə-lō-mānē-ə, -mānyə)
(mĕg′ə-lō-mānē-ə, -mānyə)n.
1. A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence.
2. An obsession with grandiose or extravagant things or actions.
meg′a·lo·mani·ac′ n.
meg′a·lo·ma·nia·cal (-mə-nīə-kəl), mega·lo·manic (-mănĭk) adj.