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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. v. To preoccupy the mind of excessively.
  2. v. To have the mind excessively preoccupied with a single emotion or topic: "She's dead. And you're still obsessing” ( Scott Turow).

Century Dictionary and Cyclopedia

  1. To besiege; beset; compass about.
  2. To attack, vex, or plague from without, as an evil spirit. See obsession, 2.

Wiktionary

  1. v. To be preoccupied with a single topic or emotion.
  2. v. To dominate the thoughts of someone.
  3. v. To think or talk obsessively about.

GNU Webster's 1913

  1. v. To besiege; to beset.
  2. v. To excessively preoccupy the thoughts or feelings of; to haunt the mind persistently.
  3. v. To be excessively or persistently preoccupied with something; -- usually used with on or over.

WordNet 3.0

  1. v. haunt like a ghost; pursue.
  2. v. be preoccupied with something

Etymologies

  1. Latin obsidēre, obsess-, to beset, occupy : ob-, on; see ob- + sedēre, to sit; see sed- in Indo-European roots.

Examples

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‘obsess’ has been looked up 1035 times, added to 4 lists, and has a Scrabble score of 8.