Occupation :: Occupation (n.) 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..
Occupation :: Occupation (n.) That which occupies or engages the time and attention; the principal business of one's life; vocation; employment; calling; trade.
Preoccupation :: Preoccupation (n.) The act of preoccupying, or taking possession of beforehand; the state of being preoccupied; prepossession..