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obsession (n.)

1510s, "action of besieging" (a sense now obsolete), from French obsession and directly from Latin obsessionem (nominative obsessio) "siege, blockade, a blocking up," noun of action from past-participle stem of obsidere "to besiege" (see obsess). Later (c. 1600), "hostile action of an evil spirit" (like possession but without the spirit actually inhabiting the body). Transferred sense of "action of anything which engrosses the mind" is from 1670s. Psychological sense "idea or image that intrudes on the mind of a person against his will" is from 1901.

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Definitions of obsession from WordNet

obsession (n.)
an irrational motive for performing trivial or repetitive actions, even against your will;
Synonyms: compulsion
obsession (n.)
an unhealthy and compulsive preoccupation with something or someone;
Synonyms: fixation
From wordnet.princeton.edu