noun (n)

• the principal activity in your life that you do to earn money(noun.act)

  Synonym:
  business, job, line, line of work
  

  source: wordnet30
• the control of a country by military forces of a foreign power(noun.act)

  Synonym:
  military control
  

  source: wordnet30
• any activity that occupies a person's attention(noun.act)

  Example:
  He missed the bell in his occupation with the computer game.
  

  source: wordnet30
• the act of occupying or taking possession of a building(noun.act)

  Example:
  Occupation of a building without a certificate of occupancy is illegal.
  

  Synonym:
  moving in, occupancy
  

  source: wordnet30
• the period of time during which a place or position or nation is occupied(noun.time)

  Example:
  During the German occupation of Paris.
  

  source: wordnet30
• The act or process of occupying or taking possession; actual possession and control; the state of being occupied; a holding or keeping; tenure; use; as, the occupation of lands by a tenant.(noun)

  source: webster1913