Entry 1 sense Webster, 1913

Megalomania

/mĕgˌ-əl-ōm-ān'-ē-ə/ · Meg·a·lo·ma·ni·a · IPA /ˌmɛɡəloʊˈmeɪniə/

01 n. A form of mental alienation in which the patient has grandiose delusions.

1.
A form of mental alienation in which the patient has grandiose delusions.(Pathol.)