A pathological obsession with one person, thing or idea.
Excessive interest or concentration on a singular object or subject.
The quality of being obsessed.
An idea that engenders a compulsive or irrational preoccupation, or the preoccupation thereby engendered.
Influence or control by evil spirits without possession.
An activity or entity that inspires a compulsive and potentially unhealthy fixation, or the fixation thereby inspired.