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Pronunciation: ob-sesh′ŭn
Definition: A recurrent and persistent idea, thought, or impulse to carry out an act that is ego dystonic, that is experienced as senseless or repugnant, and that the person cannot voluntarily suppress.
[L. obsideo, pp. -sessus, to besiege, fr. sedeo, to sit]
Examples: glitazone, GI cocktail, etc.
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