μεγαλομανία

Megalomania was coined from Greek megas (μέγας), 'great,' and mania (μανία), 'madness.' The compound did not exist in ancient Greek—it was constructed in the 19th century by French psychiatrists who needed clinical terminology and raided Greek for parts. The first documented use in a medical context appeared in French psychiatric literature around 1885, as mégalomanie.

The clinical concept preceded the word. Patients who exhibited grandiose delusions—believing themselves to be God, Napoleon, or the Emperor—had been documented in asylums since the 1700s. The French alienistes (early psychiatrists) at Salpêtrière and Bicêtre hospitals catalogued these cases meticulously. Jules Cotard described patients with inverse megalomania in 1882—people who believed they did not exist, that they had no organs, that they were already dead.

The word crossed from medicine to politics almost immediately. By the 1890s, journalists used megalomaniac to describe leaders perceived as excessively ambitious or power-hungry. Bismarck, Napoleon III, and Cecil Rhodes were all called megalomaniacs in the press. The clinical precision evaporated. Any leader with large ambitions became a megalomaniac in the newspaper.

Modern psychiatry has largely abandoned the term. The DSM-5 does not include megalomania as a diagnosis. Grandiose delusions appear under delusional disorder, and grandiosity is a symptom of narcissistic personality disorder and bipolar mania. The word lives on almost exclusively as a political and cultural accusation—a Greek compound built by French doctors, used by English journalists, answering to no clinical authority.