businessbusinessbusinessesnoun1(no plural) buying and selling things: I want to go into business when I leave school. Business is not very good this year.2(pluralbusinesses) a place where people sell or make things, for example a shop or factory3the work that you do as your job: The manager will be away on business next week.a business tripit's none of your business, mind your own businesswords that you use to tell somebody rudely that you do not want to tell them about something private: ‘Where are you going?’ ‘Mind your own business!’