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.
plural noun: obsessions "he was in the grip of an obsession he was powerless to resist"
synonyms: fixation, ruling/consuming passion, passion, mania, idée fixe, compulsion, preoccupation, infatuation, addiction, fetish, craze, hobbyhorse; More phobia, complex, neurosis; informala bee in one's bonnet, hang-up, thing "that new car has become his obsession"