Definition of "obsession" in English

noun

1. The quality of being obsessed.

2. An idea that engenders a compulsive or irrational preoccupation, or the preoccupation thereby engendered.

3. An activity or entity that inspires a compulsive and potentially unhealthy fixation, or the fixation thereby inspired.

   • Editing Wikipedia started as a hobby, but it's turned into a complete obsession of mine.

4. Influence or control by evil spirits without possession.