noun (n)

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

  Synonym:
  absorption, engrossment, preoccupation
  

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

  Synonym:
  preoccupation
  

  source: wordnet30
• The act or right of taking possession before another; as, the preoccupancy of wild land.(noun)

  source: webster1913