monomania

from WordNet (r) 3.0 (2006)
monomania
    n 1: a mania restricted to one thing or idea [syn: {monomania},
         {possession}]
    
from The Collaborative International Dictionary of English v.0.48
Monomania \Mon`o*ma"ni*a\, n. [Mono- + mania.]
   Derangement of the mind in regard of a single subject only;
   also, such a concentration of interest upon one particular
   subject or train of ideas to show mental derangement.
   [1913 Webster]

   Syn: Insanity; madness; alienation; aberration; derangement;
        mania. See {Insanity}.
        [1913 Webster]
    
from Bouvier's Law Dictionary, Revised 6th Ed (1856)
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. 
    
from Moby Thesaurus II by Grady Ward, 1.0
36 Moby Thesaurus words for "monomania":
      absorbed attention, absorption, application, complex, compulsion,
      concentration, contemplation, deep study, deep thought, engagement,
      engrossment, fascination, fixation, fixed idea, hang-up,
      hypercathexis, idee fixe, immersion, intentness, involvement,
      irresistible impulse, meditation, morbid drive, obsession,
      obsessive compulsion, possession, preoccupation, prepossession,
      profound thought, rapt attention, ruling passion,
      single-mindedness, studiousness, study, submersion, tic

    

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