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English definition of “obsession”

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obsession

noun [C or U] uk   /əbˈseʃ.ən/ us  
B2 something or someone that you think about all the time: an unhealthy obsession with death her chocolate obsession He's always wanted to find his natural mother but recently it's become an obsession.
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(Definition of obsession from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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