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English definition of “obsession”

obsession

noun [C or U]     /əbˈseʃ.ən/
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.Continually thinking about
(Definition of obsession noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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