Occupations are 1. Actual physical possession or use of a dwelling or piece of land. Occupation exists only where it is recognizable as such, and where the occupant has a sufficient measure of control that prevents interference from strangers. 2. Usual or principal business, calling, trade, or work a person is engaged in earning a living. 3. Official designation of an employed or self-employed person, such as architect, doctor, engineer, or manager.