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Synonyms
ob·ses·sion (əb-sĕsh́ən, ŏb-)

noun 

  1. Compulsive preoccupation with a fixed idea or an unwanted feeling or emotion, often accompanied by symptoms of anxiety.
  2. A compulsive, often unreasonable idea or emotion.

derivatives

ob·seśsion·al
adjective
ob·seśsion·al·ly
adverb