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Synonyms
ob·sess (əb-sĕś, ŏb-)

[Latin obsidēre, obsess-, to beset, occupy, ob-, on; see ob–, + sedēre, to sit.]

verb: -sessed, -sess·ing, -sess·es. 

transitive verb 

To preoccupy the mind of excessively.

intransitive verb 

To have the mind excessively preoccupied with a single emotion or topic: “She's dead. And you're still obsessing” (Scott Turow)

derivatives

ob·seśsor
noun