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Noun: obsession  ub'se-shun
  1. An irrational motive for performing trivial or repetitive actions, even against your will
    "her obsession to wash her hands repeatedly"
    - compulsion
     
  2. An unhealthy and compulsive preoccupation with something or someone
    - fixation

Derived forms: obsessions

See also: obsess, obsessional

Type of: irrational motive, preoccupation

Encyclopedia: Obsession