business

noun:commercial activity; the practice of buying and selling goods or services
- The city’s downtown area is bustling with business from early morning until late at night.
noun:a commercial organization such as a company
- He started his own business ten years ago.
noun:a matter or situation requiring attention or action
- The committee will deal with that particular business at the next meeting.
noun:one's personal concern or responsibility
- How you spend your money is your own business.