Obsession (noun)
A compulsive or irrational preoccupation.
Obsession (noun)
An unhealthy fixation.
Obsession (noun)
Influence or control by evil spirits without possession.
Preoccupation (noun)
The state of being preoccupied or an idea that preoccupies the mind; enthrallment.
Preoccupation (noun)
The act of occupying something before someone else.
Wiktionary
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