|1.||psychiatry a persistent idea or impulse that continually forces its way into consciousness, often associated with anxiety and mental illness|
|2.||a persistent preoccupation, idea, or feeling|
|3.||the act of obsessing or the state of being obsessed|
obsession ob·ses·sion (əb-sěsh'ən, ŏb-)
Compulsive preoccupation with an idea or an unwanted feeling or emotion, often accompanied by symptoms of anxiety.
A compulsive, often unreasonable idea or emotion.