What is Business ?
Business is (noun) 1. an occupation or trade, the work of buying or selling things She works in the electricity business. They do a lot of business with France. on business working The sales director is in Holland on business. 2. a company She runs a photography business. He runs a secondhand car business. (NOTE: The plural is businesses.) 3. an affair or concern it’s none of your business it’s nothing to do with you
source: Easier English, Student Dictionary Upper Intermediate Level