Webster's English Dictionary

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obsession

ob.ses.sion \a:b-'sesh-*n, *b-\ \-'sesh-n*l, -*n-*l\ \-e-\ n 1: a 
   persistent disturbing preoccupation with an often unreasonable idea or  
   feeling 2: an emotion or idea causing such a preoccupation  - 
   ob.ses.sion.al aj