obsession

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ob·ses·sion / əbˈseshən/ • n. the state of being obsessed with someone or something: she cared for him with a devotion bordering on obsession. ∎  an idea or thought that continually preoccupies or intrudes on a person's mind: he was in the grip of an obsession he was powerless to resist.DERIVATIVES: ob·ses·sion·al / -shənl/ adj.ob·ses·sion·al·ly / -shənl-ē/ adv.

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