monomanias

Noun

monomania (plural monomanias or monomaniæ)

1. Excessive interest or concentration on a singular object or subject.
   • It was apparent to all but himself that what was once idle curiosity had become a monomania.
2. (dated) A pathological obsession with one person, thing or idea.
   • “There are no limits to the possibilities of monomania,” I answered. “There is the condition which the modern French psychologists have called the ‘idée fixe,’ which may be trifling in character, and accompanied by complete sanity in every other way. A man who had read deeply about Napoleon, or who...1904 April 30, A[rthur] Conan Doyle, “The Adventure of the Six Napoleons”, in The Return of Sherlock Holmes, New York, N.Y.: McClure, Phillips & Co., published February 1905, →OCLC, page 212