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MONOMANIA. med. jur. Insanity only upon a particular subject; and with a single delusion of the mind.
     2. The most simple form of this disorder is that in which the patient has imbibed some single notion, contrary to common sense and to his own experience, and which seems, and no doubt really is, dependent on errors of sensation. It is supposed the mind in other respects retains its intellectual powers. In order to avoid any civil act done, or criminal responsibility incurred, it must manifestly appear that the act in question was the effect of monomania. Cyclop. Pract. Medicine, title Soundness and Unsoundness of Mind; Dr. Ray on Insanity, Sec. 203; 13 Ves. 89; 3 Bro. C. C. 444; 1 Addams' R. 283; Hagg. R. 18; 2 Addams' R. 102; 2 Addams' R. 79, 94, 209; 5 Car. & P. 168; Dr. Burrows on Insanity, 484, 485. Vide Delusion; Mania; and Trebuchet, Jur. de la Med. 55 to 58.

References in classic literature ?
I call it quite my monomania, it is such a subject of mine.
There are no limits to the possibilities of monomania," I answered.
A Taine lo fascinaban las fantasticas monomanias padecidas por los personajes dickensianos, lunaticos tan solo porque exageran fielmente lo que son: ejercen la excentricidad y hasta la locura como una opcion de libertad moral.
But here too we must see that the monomanias that take us in result from the powerlessness to resist being taken in, in a powerlessness not to continue to augment and mutate.