From The Collaborative International Dictionary of English v.0.44 [gcide]:
Monomania \Mon'o*ma"ni*a\, noun [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.
Syn: Insanity; madness; alienation; aberration; derangement; mania. See {Insanity}.
From WordNet (r) 2.0 [wn]:
noun
1: a mania restricted to one thing or idea [syn: {possession}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
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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