noun (n)

• an idea that preoccupies the mind and holds the attention(noun.cognition)

  source: wordnet30
• the mental state of being preoccupied by something(noun.cognition)

  Synonym:
  absorption, engrossment, preoccupancy
  

  source: wordnet30
• the act of taking occupancy before someone else does(noun.act)

  Synonym:
  preoccupancy
  

  source: wordnet30
• The act of preoccupying, or taking possession of beforehand; the state of being preoccupied; prepossession.(noun)

  source: webster1913