1a person’s regular occupation, profession, or trade:experts who typically conduct their business over the Internet
an activity that someone is engaged in:what is your business here?
a person’s concern:this is none of your businessthe neighbours make it their business to know all about you
work that has to be done or matters that have to be attended to:government businesslet’s get down to business
2commercial activity:firms who want to do business with Japanthe tea business [as modifier]:the business community
trade considered in terms of its volume or profitability:how’s business?the banks are continuing to lose business
[count noun] a commercial house or firm:a catering business
3 [in singular] informal a situation or series of events, typically a scandalous or discreditable one:maybe something positive will come out of the whole awful business
a difficult matter:what a business!
4 Theatre actions on stage other than dialogue.
5 (the business) British informal a very enjoyable or popular person or thing:this brandy is the business
business as usual
an ongoing and unchanging state of affairs despite difficulties or disturbances:apart from being under new management, it’s business as usual in the department
do the business
do what is required or achieve the desired result:Rogers has got to do the business, score a hat trick or something
vulgar slang have sexual intercourse.
have no business
have no right to do something:he had no business tampering with social services
operating, especially in commerce:they will have to import from overseas to remain in business
informal able to begin operations:if you’ll contact the right people, I should think we’re in business
in the business of
engaged in or prepared to engage in:I am not in the business of making accusations
like nobody's business
informal, chiefly British to an extraordinarily high degree or standard:these weeds spread like nobody’s business
mind one's own business
refrain from meddling in other people’s affairs.
send someone about their business
dated tell someone to go away.
Old Englishbisignis 'anxiety' (see busy, -ness); the sense 'state of being busy' was used from Middle English down to the 18th century, but is now differentiated as busyness. The use 'appointed task' dates from late Middle English, and from it all the other current senses have developed
Remember that business begins with busi-.
business in other Oxford dictionaries
Definition of business in the US English dictionary