The quality of being obsessed.
An idea that engenders a compulsive or irrational preoccupation, or the preoccupation thereby engendered.
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.
From Latin obsessio (“a besieging”), from obsidere (“to besiege”); see obsess. Equivalent to obsess + -ion.
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