Meaning : The principal activity in your life that you do to earn money.
Example :
He's not in my line of business.
Synonyms : business, job, line, line of work
Meaning : The control of a country by military forces of a foreign power.
Synonyms : military control
Meaning : Any activity that occupies a person's attention.
Example :
He missed the bell in his occupation with the computer game.
Meaning : The period of time during which a place or position or nation is occupied.
Example :
During the German occupation of Paris.