IPA: /əbˈsɛʃən/
KK: /əbˈsɛʃən/
A strong and persistent focus on a particular idea, feeling, or activity that can be unreasonable and often causes anxiety.
Her obsession with cleanliness made it difficult for her to relax in her own home.
Obsession is formed from "ob-" (meaning against or over) and "sedere" (meaning to sit). The word describes a state of being where thoughts sit heavily over or against one's mind, leading to an overwhelming preoccupation.
Think of thoughts that sit heavily 'over' ('ob-') your mind, which is why obsession means being preoccupied with something.