(1) A type of delusion in which the afflicted person considers himself or herself possessed of greatness. He/she believes him/herself to be Christ, God, Napoleon, anyone famous, or everyone and everything, including a lawyer, physician, clergyman, merchant, prince, or super athlete in all sports. (2) Morbid verbalized overevaluation of oneself or of some aspect of oneself. [megalo- + G. mania, frenzy]